Phases of Flight Delta Assessment Practice Test

The final preflight walk-through is done before passengers begin boarding to confirm the aircraft is safe and ready for flight. This check verifies there are no hazards around the aircraft, that exterior conditions are good, and that key surfaces and systems are accessible and functioning. Completing it before boarding allows any needed fixes to be made without delaying boarding and before engines are running, reducing risk to crew and passengers. Waiting until after boarding or after engine start would create safety risks and potential delays, so the best time is before boarding begins.