codeshare agreement

An information display showing code-shared flights (indicated by multiple flight numbers at identical times and gate numbers), at Warsaw Chopin Airport. An information display showing code-shared flights (indicated by multiple flight numbers in a single time slot), at Fukuoka Airport.

A codeshare agreement, also known simply as codeshare, is a business arrangement, common in the aviation industry, in which two or more airlines publish and market the same flight under their own airline designator and flight number (the "airline flight code") as part of their published timetable or schedule. Typically, a flight is operated by one airline (technically called an "administrating carrier" or "operating carrier") while seats are sold for the flight by all cooperating airlines using their own designator and flight number.