What should you do after ATC assigns your altitudes and flight levels while preparing for departure?

The correct approach after ATC assigns your altitude and flight levels during departure preparation is to make altitude or flight level change requests during enroute. When flying, ATC assigns altitudes to ensure safe separation between aircraft and to manage airspace efficiently. However, as a pilot, you have the authority to request altitude changes that suit your flight plan or needs, provided that these requests maintain the safety and integrity of air traffic control.

This flexibility is an essential part of operational communications with ATC and allows pilots to ensure optimal flight performance, navigate weather conditions, or accommodate deviations from the initial flight plan. It's crucial to maintain open communication and ensure that any changes comply with ATC instructions.

The other choices do not align with standard operating procedures in aviation. Taking off immediately without further clearance disregards the need for ATC instructions and oversight. Informing ATC that you no longer need the assigned altitude could lead to confusion and disrupt air traffic management. Maintaining the assigned altitude without exception limits the ability to adapt to real-time conditions and does not utilize the communication protocols that are available to pilots.