What is ATC permission for an aircraft to proceed under specified traffic conditions within controlled airspace called?

• A. Clearance
• B. Authorization
• C. Clearance limit
• D. Flight plan

Answer: (A)

ATC permission to proceed under specified traffic conditions within controlled airspace is called a clearance. It is the formal authorization that tells you what you may do—where you may go, what altitude to maintain, and any restrictions on speed or routing—under the current traffic situation. Clearances are issued before you enter or operate within controlled airspace and can apply to different phases of flight, such as en route or during approach.

Other terms don’t capture the specific authority being granted. A flight plan is the document filed before flight that outlines intended routing and other details, not the actual permission to proceed. Authorization is a broad term and lacks the precision of ATC’s formal clearance. A clearance limit is a defined boundary or time until the clearance expires, rather than the permission itself.