Glossary
Definition: 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.
Last updated
Term at a glance
| Term | Mileage Pool |
|---|---|
| One-liner | 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… |
| Where it matters | Premium-cabin booking decisions, fare-rules interpretation, airline-product comparison. |
| Related concepts | Avios · Award Chart · Mileage Balance · Saver Award · Reward Flight Saver |
| Last verified | 2026-05-07 |
A mileage pool is an arrangement under which multiple loyalty programmes share a single mileage currency. Members can transfer balances between participating programmes at 1:1 parity and redeem through any of the participating programmes' booking systems — effectively making the same mileage balance accessible through multiple booking channels.
The principal mileage pool in 2026: **Avios**. - **Members**: British Airways Executive Club (BAEC), Iberia Plus, Aer Lingus AerClub, Qatar Airways Privilege Club (joined 2023) - **Pool rules**: balance can be transferred at 1:1 between any two member programmes within 7 days; some monthly transfer caps apply - **Practical advantage**: the same redemption can be searched and booked through any of the four programmes' booking systems, often with materially different cash-fee structures for the same Avios cost
Why mileage pools matter: - **Cash-fee arbitrage**: BA-operated transatlantic redemptions on ba.com vs the same redemption on iberia.com or qatarairways.com may show different cash-fee components for the same Avios cost. Booking through the cleanest cash-fee channel is strictly better. - **Carrier-specific sweet spots**: Qatar Airways routes are bookable through ba.com (uses Privilege Club inventory); Aer Lingus routes are bookable through ba.com (AerClub inventory). The pool unlocks all member carriers' inventory through a single mileage balance. - **Award space discrepancies**: occasionally different programmes show different award space for the same flight on the same date. Searching through all four programmes' tools maximizes the chance of finding bookable space.
Other major mileage pools: - **Air France-KLM Flying Blue**: balances are merged across AF and KL programmes (effectively one programme with two brands) - **Lufthansa Group Miles & More**: balances are merged across LH, OS, LX, SN - **Star Alliance loyalty network**: not a true pool — each member runs its own programme with separate balances. Transfers between Star programmes are generally not at 1:1 parity (most are not supported at all)
Mileage pools are commercially advantageous to members because they create switching costs (it's harder to leave a programme that's pooled with three others). They are advantageous to passengers because they unlock arbitrage opportunities and simplify award booking.
In booking practice
At a Glance
| Term | Quick definition | Reference |
|---|---|---|
| Marketing Carrier | The marketing carrier is the airline whose flight number and brand appear on your ticket in a codeshare… | Read |
| Mileage Run | A mileage run is a flight taken primarily to earn frequent flyer miles or qualifying segments to achieve or… | Read |
| Low-Cost Carrier | A low-cost carrier (LCC) is an airline that offers lower fares by reducing traditional services such as free… | Read |
| Minimum Connection Time | Minimum connection time (MCT) is the shortest legally permitted time between connecting flights at an… | Read |
| Lounge Access | Lounge access refers to the ability to use airline or third-party airport lounges that offer complimentary… | Read |
| Montreal Convention | The Montreal Convention is an international treaty governing airline liability for passenger injury, death,… | Read |
Related Terms
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.
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.
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.
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.
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.
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.
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