Glossary
Interline
Definition: 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.
Interline agreements are more basic than codeshare partnerships. They allow airlines to issue tickets that include segments on partner airlines, check baggage through to the final destination across different carriers, and rebook passengers on partner airlines during irregular operations (delays, cancellations).
Without an interline agreement, passengers connecting between two airlines would need to collect and recheck their baggage, clear immigration and customs (if international), and purchase separate tickets for each airline. This makes connections risky and time-consuming.
For business class travellers, interline agreements ensure a smooth connection experience. Your checked bags transfer automatically, and if your first flight is delayed, the partner airline can rebook you. BookMyBusinessClass agents build complex itineraries using interline agreements to create optimal routings that save money while maintaining seamless connections.