Which term describes the time when the aircraft lands and is no longer airborne?

The correct term that describes the moment when the aircraft lands and is no longer airborne is "On Time." This terminology is significant in the context of flight operations, as it refers to the aircraft's successful landing and the transition from flight status to being on the ground. This terminology is often used in airline scheduling and reporting to indicate the punctuality of flights with respect to their scheduled landing times.

The other terms have different implications within the airline and aviation context. "Off Time" typically refers to the time an aircraft departs from the gate, while "Out Time" is often associated with the time the aircraft pushes back or takes off. "Outbound" relates to flights that are departing to a destination rather than indicating any specific moment in the landing process. Understanding these distinctions helps flight attendants and airline staff communicate effectively about flight operations and schedules.