What is an "ATC Clearance"?

An "ATC Clearance" refers specifically to the authorization given by Air Traffic Control (ATC) for an aircraft to proceed under Instrument Flight Rules (IFR). This clearance is a critical component of flight operations as it establishes the parameters under which a flight can navigate through controlled airspace. The ATC clearance includes important information such as the route the aircraft is cleared to fly, any altitude assignments, and specific instructions for departure or arrival procedures.

Understanding the nature of an ATC clearance is essential for pilots, as it ensures safe separation from other aircraft and adherence to air traffic protocols. Generally, obtaining this clearance is required before an aircraft can takeoff or operate within controlled airspace, making it a fundamental aspect of aviation safety and regulation.