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Interline Agreement

A bilateral agreement between airlines to accept each other's tickets and baggage.

Full definition

Interline agreements let airlines sell tickets that include segments on each other. If you book JFK-LAX on AA and LAX-HNL on Hawaiian as a single ticket, the two carriers interline. This is different from a codeshare (single flight number) — interline is cross-airline single itinerary.

Related terms

Codeshare
A flight marketed under multiple airlines' codes but operated by one.Airline Alliance
A group of airlines that share ticketing, baggage, and frequent flyer benefits.

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