What is indicated by the term "no show" in airline terminology?

The term "no show" in airline terminology specifically refers to a passenger with a confirmed reservation who does not arrive for their flight. This designation is important for airlines because it helps them manage seat inventory and overall flight capacity.

When a passenger has a confirmed booking but fails to check in or board the aircraft, they are considered a "no show." Understanding this term is critical for flight attendants and other airline staff as it impacts seat availability, potential overbooking policies, and revenue management since the seat remains unoccupied and cannot be filled by another passenger.

In contrast, the other options describe different scenarios that do not align with the "no show" definition. For example, a passenger who is late does not qualify as a no show until the flight has departed. Similarly, those who change their flight or have been waitlisted have not missed their scheduled flight, thus not fitting the criteria of a no show.