Definition
The pilot's authority and responsibility to postpone the start of a flight, or to end a flight already in progress, when conditions, equipment, or personal readiness do not support a safe outcome. It is exercised at the pilot's discretion as part of risk management and is not contingent on permission from passengers, employers, or schedules.
Plain English
The pilot's right and duty to wait before taking off, or to land early and stop the flight, whenever something makes continuing unsafe.
Context Anchor
Used in risk management, especially when an instructor, student pilot, or pilot in command decides whether a lesson or flight should start, continue, or stop.
Derivation
Terminate comes from the Latin terminus, meaning boundary or end point. In this aviation use, it means bringing the flight to a safe end, not doing something sudden or dramatic.
Why Pilots Care
Protects safety by allowing the instructor to act on professional judgment rather than external pressure to complete the lesson.
Intuition Check
Do not read terminate as something violent or catastrophic. Here, delay means wait before flying, and terminate means intentionally end the flight safely.
Example Sentence 1
After noticing the weather closing in faster than forecast, the pilot chose to delay the flight by two hours and recheck conditions.
Example Sentence 2
If the student appears overly stressed during preflight, the CFI may delay or terminate any flight until the student is ready.