During what phase does the agent advise the crew that the aircraft is ready for push?

The phase where the agent advises the crew that the aircraft is ready for push is during the Pushback Preparation. This is a critical phase in the ramp operations before the aircraft departs from the gate. During Pushback Preparation, the ramp agent conducts final checks to ensure that all pre-departure tasks have been completed, which may include confirming that the loading of cargo and passengers is finished, safety checks are clear, and that ground support equipment is in position.

Once all of these aspects are confirmed, the ramp agent signals to the flight crew and ground personnel that the aircraft is ready for pushback from the gate. Effective communication at this stage is essential for ensuring a smooth and safe departure process. The other phases mentioned—such as Departure Check, Loading Phase, and Pre-boarding—serve different functions in the overall boarding and departure processes and do not specifically encompass the declaration that the aircraft is ready for pushback.