Which of the following phases of flight requires specific duties from flight attendants?

The pre-flight, in-flight, and post-flight phases are critical components of a flight where flight attendants have defined responsibilities to ensure passenger safety and comfort. During the pre-flight phase, flight attendants conduct safety checks, prepare the cabin, and inform passengers about emergency procedures. This preparation is essential for facilitating a smooth boarding process and ensuring that all safety equipment is in place and functioning.

In the in-flight phase, flight attendants are actively engaged with passengers, providing service and monitoring safety. They must be attentive to any emergencies that may arise during flight, manage cabin service, and respond to passengers' needs. This phase is vital for ensuring that passengers feel safe and comfortable throughout the flight.

Finally, during the post-flight phase, flight attendants are responsible for ensuring the cabin is secured and assisting passengers during disembarkation. They handle the final checks of the aircraft and provide necessary information as passengers leave. Each of these phases has specific duties that are outlined in training, ensuring that flight attendants are prepared for their roles and responsibilities throughout the entire flight experience.

The other choices focus on specific moments or actions that do not encapsulate the full range of duties flight attendants perform during the entire phase of a flight, thus making them less comprehensive than the selected answer.