Which information is part of an abbreviated clearance that states "cleared as filed"?

Answer: C — Destination airport, en route altitude, transponder code, and departure procedures.

When air traffic control issues an abbreviated clearance that states "cleared as filed," it indicates that the aircraft is authorized to follow the flight plan that has been previously filed by the pilot. This phrase simplifies the clearance process by confirming that the flight will proceed according to the existing flight plan without any alterations. The correct choice includes essential information such as the destination airport, en route altitude, transponder code, and departure procedures. The destination airport is critical as it identifies where the flight is headed. The en route altitude provides a clear indication of the altitude at which the aircraft is to operate during the flight, ensuring safe vertical separation from other aircraft. The transponder code is vital for identification and tracking of the aircraft within the air traffic control system, helping to maintain safety and situational awareness. Finally, departure procedures outline the specific maneuvers and ways in which the aircraft should execute its initial flight, further contributing to safe and efficient operations. In contrast, the other options contain elements that do not fully align with an abbreviated clearance context. For instance, while clearance limits and departure procedures are important in some clearances, they don't encapsulate the breadth of information necessary for defining a "cleared as filed" scenario comprehensively. This option distinctly captures the core