What does 'swap' refer to in flight crew terms?

In flight crew terminology, a 'swap' specifically refers to a trip trade with open time. This means that a flight attendant or crew member is exchanging their assigned trip with another crew member who is seeking to take on those flight duties. This process often involves coordinating schedules to ensure that both crew members are available and that their respective needs are met.

Choosing this answer indicates an understanding of how flight crews manage their schedules and the flexibility that comes with trading duties. Crew members often have the option to adjust their flights based on personal needs, and a 'swap' is a common practice that allows them to be more flexible with their time off or assignments.

The other options focus on different aspects of flight operations and crew management. A change in aircraft type pertains to the aircraft being used, while time off refers to scheduled leave for crew members, and a flight schedule delay involves timing issues related to the flight itself, none of which align with the specific definition of a 'swap' within flight crew operations.