What best defines a flight segment?

• A. It is the period from takeoff to landing
• B. It is the period from start of taxi to engine shutdown
• C. It is only the in-flight portion
• D. It is the time from door closed to door open

Answer: (A)

A flight segment is the leg of a trip from liftoff to touchdown—the period the aircraft is airborne on that specific flight between two points. It includes the climb, cruise, descent, and approach, ending when the wheels touch down. Ground activities such as taxiing before takeoff, starting engines, or shutting down after landing aren’t part of this segment.

Why this fits best: defining the segment from takeoff to landing captures the actual flight portion of the leg, which is the core idea behind a single flight segment.

The other ideas don’t fit as cleanly: taxiing and engine start/shutdown occur on the ground and belong to surface timing rather than the in-air leg; the phrase “only the in-flight portion” misses the takeoff and landing events that start and end the segment; and door-open/door-close timing describes gate-to-gate (block) time, not the airborne flight segment.