Definition:
An agreement between airlines to sell space on each other's flights.
The flights will have both the operating carrier's flight number (the airline that is using its aircraft for the flight), and the codesharing flight number (the partner airline in the agreement sells space on the flight as if it were its own, and has its own flight number).
For example, Air Canada operates flight AC812 from Chicago O'Hare to Toronto Pearson. United codeshares on this flight, selling space as UA3094.
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