What aspect is not part of the definition of "delay" during a flight?

The definition of "delay" in the context of flight operations typically refers to any additional time that a flight spends outside of its scheduled timeline, which affects its operational efficiency or the experience of passengers. This can include waiting for takeoff, delays during boarding, or time spent deplaning after arrival.

The aspect that is not considered part of this definition is the time gained during in-flight operations. If a flight is able to save time while in the air—due to factors such as favorable winds or efficient routing—this is considered an operational savings rather than a delay. Thus, while delays indicate extended waiting periods that disrupt schedules, time gained reflects an improvement in operational efficiency, allowing flights to arrive ahead of schedule, and is not a form of delay.