Pairings
Work schedules in the airlines industry must cover not just a shift or a day, as workers in other industries might. Airlines work schedules consist of assignments called "crew pairings" or simply "pairings", which is a sequence of flights or legs that starts and then ends at the same domicile. Pairings are usually created by another computer program called pairing optimizer.
Read more about this topic: Preferential Bidding System