What does "Off Time" refer to in aviation terms?

In aviation terms, "Off Time" specifically refers to the recorded moment when the aircraft departs from the ground, marking the beginning of the flight's journey. This is a crucial aspect of flight operations, as it helps in tracking the efficiency and punctuality of airline schedules. Accurate recording of off time is essential for ensuring that flight operations adhere to planned timetables and for coordinating with air traffic control, which monitors flight movements.

While the other options touch on important aviation milestones—such as the time an aircraft touches down or when passengers board—none accurately define "Off Time." The concept is strictly associated with the initiation of flight, reinforcing the importance of this terminology in the aviation industry. Understanding these definitions helps flight attendants and other airline personnel maintain clarity in communication regarding flight statuses and operations.