What is the consequence of not acknowledging clearance delivery?

Not acknowledging clearance delivery can lead to a range of consequences that impact the safety and efficiency of flight operations. By failing to acknowledge clearance delivery, a pilot may inadvertently contribute to potential misunderstandings of instructions. This is crucial because clearance delivery provides important information such as your flight plan, squawk code, and taxi instructions. If this information is not confirmed, the pilot may attempt to fly with incorrect or incomplete information, leading to confusion later during the flight.

Additionally, not acknowledging these instructions can create delays in the flight. Air traffic control expects timely communication and acknowledgment from pilots. If a pilot does not respond, ATC may assume there’s an issue that requires further engagement, potentially causing a buildup of traffic and subsequent delays for the flight and others in the area.

The combination of these factors means that the failure to acknowledge clearance delivery can indeed yield immediate consequences—for the pilot, the flight operation, and overall traffic management, making 'all of the above' a comprehensive answer.