What should a controller request from a pilot upon initial contact regarding altitude?

When a controller makes initial contact with a pilot, one of the primary responsibilities is to ensure that the aircraft is maintaining the correct altitude as per the air traffic control (ATC) instructions. Requesting verification of the assigned altitude is crucial for safe separation between aircraft and for maintaining overall airspace safety.

By confirming the assigned altitude, the controller can ensure that the pilot is aware of and adhering to any altitude restrictions or instructions previously given. This is particularly important in busy airspace where altitude discrepancies could lead to potential conflicts with other aircraft. Additionally, it helps to confirm that the aircraft's altimeter settings are correct and that there are no misunderstandings regarding the altitude the pilot is supposed to be flying at.

Other aspects, such as weight, speed, and destination, while important for various operational and safety reasons, do not take precedence over the immediate need to confirm altitude, which directly impacts the safety and efficiency of air traffic control operations.