Business class glossary

A Chinese government policy permitting visa-exempt 144-hour transit through certain Chinese cities (Beijing, Shanghai, Guangzhou, etc.) for most Western nationalities en route to a third country. The policy allows leaving the airport during the layover but is geographically restricted to specific transit zones.

ABTA (Association of British Travel Agents) is a UK trade association for travel agents and tour operators that provides a code of conduct, dispute resolution, and financial protection for consumers.

A UK government tax on commercial passenger flights departing UK airports, applied at varying rates by destination band and cabin class. APD is one of the largest cash-component drivers on London-bound award redemptions; the premium-cabin rate on long-haul departures from London exceeds £200 per passenger one-way.

The Airbus A350 is a modern, fuel-efficient wide-body aircraft that features a composite fuselage, improved cabin pressure, wider cabin, and quieter engines, making it one of the most comfortable aircraft for long-haul business class travel.

The Airbus A380 is the world’s largest passenger aircraft, a double-decker superjumbo capable of carrying over 500 passengers, known for its spacious cabins and quiet flight experience.

The artificial atmospheric pressure maintained inside an aircraft cabin during flight. Modern aircraft (787, A350) maintain a lower cabin altitude (6,000 ft equivalent) than older aircraft (8,000 ft equivalent), reducing the physiological effects of high-altitude exposure.

Airside is the area of an airport beyond security and passport control, where passengers wait for their flights, access lounges, and board aircraft. It is the secure zone inaccessible to non-passengers.

An amenity kit is a complimentary pouch or bag provided to business and first class passengers containing personal care items such as moisturiser, lip balm, eye mask, earplugs, socks, and often luxury brand toiletries.

An angle-flat seat is a business class seat that reclines to approximately 160–170 degrees rather than a full 180-degree lie-flat position, creating a slight incline when fully reclined.

A regulatory grant allowing two or more airlines to coordinate schedules, capacity, and revenue on a specified corridor without violating antitrust law. ATI is the legal foundation enabling Joint Businesses and Joint Ventures; granted by the US DOT, EU Commission, and other regulators on a case-by-case basis with periodic sunset reviews.

An arrival lounge is an airport lounge available to premium passengers after landing, offering showers, breakfast, ironing services, and workspace to help travellers freshen up before proceeding to their destination.

ATOL (Air Travel Organiser’s Licence) is a UK financial protection scheme managed by the Civil Aviation Authority (CAA) that protects holidaymakers if their travel company fails, ensuring refunds or repatriation.

A published table by a frequent-flyer programme listing the mileage cost of redeeming an award flight, typically broken down by region or distance band, cabin class, and partner carrier. Published award charts are predictable and rate-stable; programmes that have abandoned them (United MileagePlus 2019, Delta SkyMiles 2015) price awards dynamically with cash-fare value as the input.

An award ticket is a flight booked using frequent flyer miles or points instead of cash, allowing loyalty programme members to fly for free or at reduced cost by redeeming accumulated miles.

Baggage allowance is the amount of luggage (checked and carry-on) a passenger is permitted to bring on a flight, typically determined by cabin class. Business class usually allows 2 checked bags of 32kg each.

Boarding process using facial recognition technology to verify passenger identity instead of traditional boarding pass scans. Increasingly deployed at major US international airports, particularly for international departures, allowing passengers to board with a simple face scan.

A boarding pass is a document issued by an airline during check-in that permits a passenger to board a specific flight, showing the passenger name, flight number, seat assignment, boarding time, and gate.

The Boeing 787 Dreamliner is a modern wide-body aircraft renowned for its fuel efficiency, composite construction, larger windows, higher cabin pressure, and improved humidity — all of which reduce jet lag and enhance passenger comfort.

Book the Cook is Singapore Airlines’ pre-order dining service that allows business and first class passengers to select their preferred main course from an extensive menu before their flight, guaranteeing their first-choice meal.

A booking reference is a unique alphanumeric code (typically 6 characters) assigned to your flight reservation, used to retrieve and manage your booking online, at check-in kiosks, and with airline staff.

BSP is IATA’s financial settlement system that processes transactions between airlines and travel agents, ensuring secure, standardised handling of ticket payments across the global distribution network.

Business class is a premium cabin on commercial airlines positioned between first class and economy. It typically offers lie-flat seats, priority boarding, lounge access, enhanced meals and drinks, larger baggage allowance, and superior service.

Cabin crew (also called flight attendants) are airline employees responsible for passenger safety, service, and comfort during flights. Business and first class cabins have dedicated crew members providing personalised service.

A cash-fee component charged by certain carriers on award redemptions, on top of government taxes and the mileage cost. Carrier surcharges (often coded YQ on tickets) reflect fuel-cost recovery in the historic IATA fare construction; the actual fee rarely correlates with current fuel prices in 2026.

A fee charged by airlines to modify a booking after purchase — typically applied to non-refundable fares. Most major US airlines eliminated change fees on most international tickets in 2020-2021, though some restrictions returned in 2024-2025 on the deepest discount fare buckets.

Chauffeur drive is a complimentary ground transfer service offered by select airlines to first and business class passengers, providing a luxury car and driver to take you to or from the airport.

Circadian rhythm is the body’s natural 24-hour internal clock that regulates sleep-wake cycles, hormone release, and other physiological processes. Long-haul air travel disrupts this rhythm, causing jet lag.

British Airways' refreshed business class product, replacing the previous Club World cabin. Features 1-2-1 reverse herringbone configuration with full sliding doors, direct aisle access from every seat, and a 23-inch IFE screen.

A codeshare is a commercial arrangement where two or more airlines sell seats on the same flight under different flight numbers, allowing each airline to market the flight as its own.

A companion ticket (or companion certificate) is a benefit that allows an elite frequent flyer or credit card holder to book a second ticket for free or at a deep discount when purchasing a full-fare ticket.

A complimentary upgrade is a free cabin class upgrade offered by an airline to eligible passengers, typically elite frequent flyers, moving them from economy to business class or business to first class at no additional cost.

A connecting flight is a multi-segment journey where passengers change aircraft at an intermediate airport, continuing to their final destination on a different flight number.

A consolidator fare is an unpublished, discounted airline ticket purchased in bulk by an accredited travel agency (a "consolidator") and sold to consumers at rates below the airline's published retail fares. These fares are typically 30-70% below what you'd find on Google Flights or Expedia.

A host consolidator network is an established travel agency or network that holds wholesale airline fare contracts and issues tickets on behalf of specialist consolidator agencies. Specialist consolidators source net fares and book under the host’s ticketing infrastructure.

Consumer protection in air travel encompasses the laws, regulations, and industry standards that safeguard passengers’ rights regarding refunds, compensation, safety, and fair treatment by airlines and travel agencies.

A day room is a hotel room booked for daytime use rather than overnight, typically for a few hours, allowing travellers to rest, shower, and refresh during long layovers or early arrivals.

A dead-leg (or empty leg) is a flight segment that an aircraft must operate without revenue passengers, typically a repositioning flight. In commercial aviation, it can also refer to heavily discounted fares on underbooked segments.

Denied boarding occurs when an airline refuses to allow a confirmed, checked-in passenger to board a flight, usually due to overbooking. Passengers are entitled to compensation and rebooking under DOT and EU261 rules.

Dine on demand is a business or first class meal service where passengers choose when to eat during the flight rather than following the cabin’s fixed meal schedule, offering restaurant-style flexibility.

A UK transit visa required for certain visa-required nationalities to connect through a UK airport even when staying entirely airside. DATV is distinct from a full UK visa — it permits airside transit only, no UK entry. Visa-Waiver-eligible nationalities do not need DATV.

Direct aisle access means every seat in a business or first class cabin can reach the aisle without stepping over or disturbing another passenger, typically achieved through 1-2-1 or 1-1-1 configurations.

A direct flight operates from origin to destination under a single flight number, though it may make intermediate stops. It differs from a non-stop flight (no stops) and a connecting flight (different flight numbers).

An award chart that prices redemptions on great-circle miles flown rather than region pairs, typically with peak / off-peak tier modifiers. Aeroplan and British Airways Avios are the two most prominent distance-based charts among major programmes; they are predictable and reward shorter stage lengths disproportionately.

The US Department of Transportation (DOT) refund rule requires airlines to provide automatic cash refunds for significantly delayed or cancelled flights, and for services like checked bags that aren’t delivered as promised.

Dynamic pricing is a pricing strategy where airline ticket prices change in real-time based on demand, supply, booking patterns, and other market factors, meaning the same seat can have vastly different prices at different times.

An e-ticket (electronic ticket) is a digital airline ticket stored in the airline’s reservation system, replacing the traditional paper ticket. It is identified by a 13-digit ticket number and linked to your PNR.

Economy plus (also called extra legroom economy) is an enhanced economy seat offering additional legroom and sometimes priority boarding, without the full premium economy cabin experience.

Elite status is a tier level within an airline frequent flyer programme earned by meeting minimum flying or spending thresholds, granting benefits like complimentary upgrades, lounge access, priority boarding, and bonus miles.

An endorsement is a notation in the "Endorsement/Restrictions" box of an airline ticket (or its electronic equivalent) that records fare restrictions, refundability rules, change fees, and which other carriers can or cannot accept the ticket. Critical when rebooking on a different airline during disruptions.

Electronic System for Travel Authorization — a US Customs and Border Protection pre-departure authorization required for visa-free entry to the United States by Visa Waiver Program-eligible nationalities. Required for both entry and most transit through US airports; valid for 2 years (or until passport expires).

EU261 (EC Regulation 261/2004) is European legislation that entitles air passengers to compensation, care, and assistance when flights departing from or arriving in the EU are delayed, cancelled, or overbooked.

A United MileagePlus benefit allowing elite members to add a free Star Alliance partner stopover to a one-way award redemption at no additional miles cost. Originally a 2009 programme feature, the Excursion Perk has survived multiple programme restructures and remains a sweet-spot stretch for stopover-style itineraries.

A fare basis code is an alphanumeric code on your airline ticket that identifies the exact fare rules including the fare class, routing, validity period, advance purchase requirements, and change/refund conditions.

A fare bucket is the limited inventory of seats available at a specific fare class and price level on a given flight. Airlines allocate different numbers of seats to each bucket, and prices increase as cheaper buckets sell out.

A fare class (or booking class) is a letter code assigned to an airline ticket that determines its price, refund/change rules, mileage earning rate, and upgrade eligibility. Each cabin contains multiple fare classes at different price points.

Fare combinability rules govern whether two different fares (e.g. one outbound, one return) can be combined into a single ticket. Restricted combinability can prevent mixing certain fare types or carriers, while open combinability allows flexibility — important for multi-city, open-jaw, and one-way premium itineraries.

Fast track is a priority security and immigration lane at airports that allows business class, first class, and elite status passengers to bypass standard queues, reducing wait times significantly.

A fifth freedom flight is a route operated by an airline between two foreign countries as part of a longer service originating or terminating in its home country, often offering unique premium products on unexpected routes.

First class is the highest cabin class on a commercial aircraft, offering the most spacious seating, premium dining, exclusive lounge access, and personalised service.

A flat bed is a business or first class seat that converts into a fully horizontal sleeping surface, synonymous with a lie-flat seat. The term emphasises the bed-like sleeping experience rather than the seating mechanism.

Frequent flyer miles (or points) are loyalty currency earned by flying with an airline or its partners, and through credit card spending, which can be redeemed for flights, upgrades, lounge access, and other travel benefits.

A full-service carrier (FSC) is a traditional airline offering a comprehensive range of services including multiple cabin classes, included meals and baggage, lounge access, and connecting itineraries through hub networks.

A GDS (Global Distribution System) is a computerised reservation network used by travel agents to search, compare, and book airline tickets, hotels, and car rentals across hundreds of suppliers in real-time.

Global Entry is a US Customs and Border Protection trusted-traveler program that provides expedited clearance for pre-approved, low-risk international arrivals at US airports. Membership is $100 for 5 years and includes TSA PreCheck for domestic departures.

A herringbone configuration is a business class seat layout where seats are angled towards the cabin walls in a zigzag pattern, typically providing direct aisle access for every passenger in a 1-2-1 arrangement.

A hub airport is a central airport used by an airline as a transfer point to funnel passengers from many origins to many destinations, creating efficient connecting itineraries through a single point.

An airline route network model where most flights connect through a small number of major hub airports rather than flying point-to-point between every city pair. Used by virtually every major international carrier — enables high-frequency connectivity, premium-cabin viability, and economic efficiency.

IATA (International Air Transport Association) is the global trade association for airlines, representing approximately 300 airlines comprising 83% of total air traffic. IATA sets industry standards for ticketing, safety, and operations.

In-flight entertainment (IFE) is the onboard system providing movies, TV shows, music, games, and other media to passengers, typically via personal seatback screens in premium cabins with noise-cancelling headphones.

An interline agreement is an arrangement between two or more airlines to handle passengers travelling on itineraries that involve flights on multiple carriers, including through-checked baggage and coordinated rebooking during disruptions.

Jet lag is a temporary sleep disorder caused by rapid travel across multiple time zones, resulting in fatigue, insomnia, difficulty concentrating, and digestive issues as your body’s circadian rhythm adjusts to the new time zone.

A deeper commercial arrangement than codeshare alone, where partner airlines coordinate scheduling, capacity, and revenue on a corridor under regulatory antitrust immunity. The major transatlantic Joint Businesses (oneworld AA-BA-IB-AY-EI, SkyTeam DL-AF-KL-VS, Star Alliance UA-LH-AC) are the principal commercial structures shaping premium-cabin booking on those corridors.

A formal commercial agreement between airlines (often within an alliance) to coordinate schedules, share revenue, and operate as a single network on specific transcontinental corridors. JVs typically receive antitrust immunity from regulators, allowing deeper coordination than standard codeshare partnerships.

An electronic travel authorization required for visa-free entry into South Korea by most Western nationalities since 2024. K-ETA pre-clearance is required online before departure for visa-exempt visits; transit passengers staying airside under 24 hours generally do not need K-ETA.

Landside is the area of an airport before security and passport control, accessible to the general public including non-travellers. It includes check-in halls, arrivals areas, and public facilities.

A layover is a brief stop at an intermediate airport during a connecting itinerary, typically lasting less than 24 hours, during which passengers wait for their next flight without leaving the transit area.

A lie-flat seat is a business or first class airline seat that reclines to a fully horizontal 180-degree position, allowing passengers to sleep flat during long-haul flights.

Lounge access refers to the ability to use airline or third-party airport lounges that offer complimentary food, drinks, Wi-Fi, showers, and comfortable seating before or between flights.

A low-cost carrier (LCC) is an airline that offers lower fares by reducing traditional services such as free meals, baggage, and seat selection, operating with lower costs and often point-to-point networks.

The marketing carrier is the airline whose flight number and brand appear on your ticket in a codeshare arrangement, which may be different from the operating carrier that actually operates the aircraft.

An arrangement under which two or more frequent-flyer programmes share a single mileage currency, allowing balances to be transferred between accounts at parity (1:1) and redeemed through any participating programme's booking system. The Avios pool (BAEC, Iberia Plus, AerClub, Qatar Privilege Club) is the most prominent mileage pool in operation as of 2026.

A mileage run is a flight taken primarily to earn frequent flyer miles or qualifying segments to achieve or maintain elite status, rather than for the destination itself.

Minimum connection time (MCT) is the shortest legally permitted time between connecting flights at an airport, set by aviation authorities based on the airport’s layout, terminal configuration, and security requirements.

The Montreal Convention is an international treaty governing airline liability for passenger injury, death, baggage damage or loss, and flight delays on international air travel, setting maximum compensation limits.

A multi-city itinerary is a flight booking that includes segments to multiple destinations in a single ticket, allowing travellers to visit several cities without backtracking or purchasing separate tickets.

A narrow-body aircraft (also called a single-aisle aircraft) is a smaller passenger airplane with one central aisle, typically used for short-haul and domestic flights, seating 100–240 passengers.

NDC (New Distribution Capability) is an IATA-driven technology standard that allows airlines to distribute personalised offers, ancillary products, and dynamic pricing directly to travel agents and booking channels.

Noise-cancelling headphones are premium audio devices provided to business and first class passengers that use active technology to reduce ambient engine and cabin noise, enhancing the in-flight entertainment and rest experience.

Oneworld is one of the three major global airline alliances, comprising 13 member airlines including British Airways, Cathay Pacific, Qantas, American Airlines, and Japan Airlines.

An open jaw ticket is a return flight where the departure and arrival cities differ on the outbound and return legs, creating a gap ("jaw") in the routing that the passenger fills independently.

Open Skies is a bilateral or multilateral aviation policy framework that liberalizes international air service between countries — eliminating restrictions on which carriers can fly between which cities, what frequencies they can operate, and what prices they can charge. The result: more competition, more route options, and lower premium-cabin pricing.

The operating carrier is the airline that actually operates the aircraft on a codeshare flight, providing the plane, crew, and onboard service, regardless of which airline’s flight number appears on your ticket.

Overbooking is the airline practice of selling more tickets for a flight than there are seats available, based on statistical predictions that some passengers will not show up.

Pajama service is a premium amenity offered by select airlines in business and first class, providing passengers with comfortable sleepwear to change into during overnight flights.

A PNR (Passenger Name Record) is a unique alphanumeric booking reference code stored in the airline’s reservation system containing all details of your itinerary, passenger information, and ticket data.

Point-to-point flying is a network model where airlines operate direct flights between city pairs without requiring passengers to connect through a central hub, offering convenience but fewer route options.

United Airlines' long-haul business class product. Features lie-flat seats with direct aisle access on widebody fleet (787, 777, 767), with newer 787-9 and 787-10 deliveries featuring the upgraded Polaris with sliding-door suites. Includes Polaris lounge access at major US hubs.

A positioning flight is a short flight taken to reach a departure airport that offers better fares, routings, or availability for the main journey, often saving significant money on business class tickets.

A pre-departure drink is a complimentary beverage (typically champagne, juice, or water) served to business and first class passengers after boarding and before the aircraft departs, setting the premium tone for the flight.

Premium economy is a cabin class positioned between economy and business class, offering wider seats, more legroom, enhanced meals, and priority services at a moderate price premium over economy.

Priority boarding allows business class, first class, and elite frequent flyer passengers to board the aircraft before general economy boarding, ensuring access to overhead bin space and a relaxed boarding experience.

Priority Pass is the world’s largest independent airport lounge access programme, providing entry to over 1,500 lounges and airport experiences in 600+ cities regardless of airline or class of travel.

A published fare is the standard retail price for an airline ticket that is publicly available through the airline’s website, online travel agencies, and fare comparison sites. It contrasts with unpublished consolidator fares.

Qatar Airways' flagship business class product, widely rated the best business class in commercial aviation. Features 1-2-1 herringbone configuration with sliding privacy doors, double-bed mode for traveling pairs, and on-demand dining service.

The arrangement under which premium-cabin passengers and elite-status holders on one airline can access another airline's lounges at airports where the partner operates. Reciprocal access is most commonly governed by alliance membership (Star Alliance, oneworld, SkyTeam) and JV agreements, with rules varying by alliance and partner.

A recliner seat is a premium cabin seat that reclines significantly more than economy but does not reach a fully flat or even angle-flat position, common in domestic and short-haul business class.

A red-eye flight is an overnight flight that departs late at night and arrives early the next morning, named for the tired, red eyes of passengers who have difficulty sleeping during the flight.

A refundable fare allows the passenger to cancel the ticket and receive most or all of the fare back as a cash refund. Refundable business class fares typically cost 20-50% more than non-refundable equivalents but provide essential flexibility for business travel where plans may change.

Revenue management is the strategic use of pricing, inventory control, and demand forecasting to maximise an airline’s total revenue from each flight, determining how many seats to sell at each price point.

Reverse herringbone is a premium cabin seat layout where seats angle toward the aircraft windows rather than the aisle, offering enhanced privacy and direct aisle access in a 1-2-1 configuration.

British Airways Executive Club's award-redemption pricing structure introduced for short-haul in 2011 and extended to long-haul / premium cabins in 2023. Reward Flight Saver allows holders to slide their redemption between higher-Avios + lower-cash and lower-Avios + higher-cash combinations, replacing the previous fixed peak / off-peak chart.

A round-the-world (RTW) fare is a single ticket that lets you circumnavigate the globe with multiple stops, typically priced by total distance flown rather than per-segment. Sold by the major airline alliances (Star Alliance, Oneworld, SkyTeam) and a small number of independent ticketing networks.

The lowest published (or observed) mileage cost for a redemption — the "saver" rate on award-chart programmes. Saver award space is the controlled redemption inventory most aggressively priced; partner-award redemptions on alliance carriers typically book into saver space.

A short-stay visa valid for travel within the 27-country Schengen Area in Europe. Visa-required nationalities must obtain a Schengen visa before travel; visa-exempt nationalities can enter without a visa for stays up to 90 days within any 180-day period. Connecting through a Schengen airport and staying airside does not require a Schengen visa for most visa-required nationalities.

A seat map is a graphical layout of an aircraft cabin showing seat positions, numbering, lavatories, galleys, and emergency exits. Used during booking to select a specific seat, particularly important in business class where seat configuration varies dramatically (window vs aisle, facing forward vs reverse, throne seats, paired vs solo).

Seat pitch is the distance between a point on one seat and the same point on the seat in front, measured in inches. It is the primary indicator of legroom in an aircraft cabin.

SkyTeam is a global airline alliance of 19 member airlines including Delta Air Lines, Air France-KLM, Korean Air, and China Airlines, connecting passengers to over 1,000 destinations worldwide.

Special meal codes are 4-letter IATA designators for non-standard in-flight meals, ordered in advance to accommodate dietary, religious, or medical needs. Common codes include VGML (vegetarian), KSML (kosher), HNML (Hindu non-vegetarian), GFML (gluten-free), and DBML (diabetic).

A staggered configuration is a business class seat layout where seats in adjacent rows are positioned at different distances from the aisle, creating a diagonal pattern that provides direct aisle access and varied seat widths.

Star Alliance is the world’s largest airline alliance with 26 member airlines including Lufthansa, United Airlines, Singapore Airlines, ANA, and Turkish Airlines, serving over 1,200 destinations.

The highest standard elite tier in the Star Alliance frequent-flyer ecosystem, accrued by reaching the Gold-equivalent status on any Star Alliance member airline's programme (e.g. United Premier 1K, Lufthansa Senator, Singapore KrisFlyer Gold). Star Alliance Gold unlocks lounge access, priority benefits, and enhanced baggage allowance across all Star Alliance carriers.

A status match is when an airline grants you equivalent elite status in their frequent flyer programme based on elite status you hold with a competing airline, allowing you to enjoy benefits without starting from scratch.

A stopover is a deliberate break in a journey at an intermediate point lasting more than 24 hours for international flights (or more than 4 hours for domestic flights), allowing passengers to explore a connecting city.

An airline-offered benefit allowing passengers to stop in a connecting hub city for an extended period (typically 24 hours to 7 days) at no additional fare. Iceland, Singapore, Qatar, Turkish Airlines, and several others offer flagship stopover programs that effectively give travelers two destinations on one ticket.

An Aeroplan award-redemption feature allowing holders to add a stopover (24+ hours) at any Star Alliance partner hub for an additional 5,000 miles. Combined with Aeroplan's distance-based chart, the Stopover Reward is one of the most flexible stopover features in any major frequent-flyer programme.

An airline suite is a premium cabin seat enclosed by walls and a closing door, offering a private room-like experience at 40,000 feet. Suites are found in both first class and modern business class products.

An award-chart redemption where the combination of cabin product, mileage cost, and cash fees aligns favorably for the holder — typically a partner-metal redemption priced at a published rate that is materially below the cash-fare equivalent. Sweet spots are programme-specific and shift over time as charts restructure.

A throne seat is a premium cabin seat in the centre of a row that benefits from extra width and storage because it has no neighbour on either side, creating an exceptionally spacious and private experience.

Through-checked baggage is luggage that is checked at the origin airport and automatically transferred through connecting flights to the final destination without the passenger needing to collect and recheck it.

A free city tour service offered by Turkish Airlines for transit passengers with 6+ hour layovers at Istanbul Airport (IST). The programme provides guided tours of major Istanbul attractions during the layover at no charge — a unique commercial differentiator on Turkish Airlines' Europe-Asia and Europe-Africa connecting traffic.

A transit hotel is a hotel located within the airside area of an airport, allowing connecting passengers to rest in a proper hotel room without clearing immigration or leaving the secure zone.

A travel agent is a professional who arranges and sells travel services including airline tickets, hotels, and tours on behalf of clients, often accessing inventory and pricing not available to the general public.

Travel insurance is a policy that covers financial losses from trip cancellations, medical emergencies, baggage loss, flight delays, and other travel disruptions, providing peace of mind for expensive business class bookings.

TSA PreCheck is a US Transportation Security Administration trusted-traveler program providing expedited security screening at over 200 US airports for pre-approved travelers. Members keep shoes, belts, and light jackets on, leave laptops and TSA-compliant liquids in their bags, and use dedicated faster lanes.

Turn-down service in airline business and first class is when cabin crew convert your seat into a bed, laying out a mattress pad, sheets, duvet, and pillows to create a comfortable sleeping environment.

Twin-aisle is another term for wide-body aircraft, referring to the two passenger aisles that run the length of the cabin, allowing wider seating configurations and more spacious premium cabins.

A program where US Customs and Border Protection (CBP) operates immigration and customs facilities at foreign airports, allowing passengers to clear US entry before boarding. Available at 15 airports including Dublin, Shannon, Aruba, Bermuda, Bahamas, Abu Dhabi, and several Canadian cities.

A wet lease is when one airline (the lessor) provides an aircraft, complete crew, maintenance, and insurance (ACMI) to another airline (the lessee) that operates the flight under its own brand. Common for capacity expansion, seasonal demand, or covering aircraft maintenance.

A wide-body aircraft (also called a twin-aisle aircraft) is a large passenger airplane with two passenger aisles, typically used for long-haul international flights and capable of carrying 200–850 passengers.

Yield management is the revenue optimisation strategy airlines use to dynamically adjust ticket prices based on demand, booking pace, competition, and time to departure, maximising revenue per flight.