Definition
The fix, point, or location to which an aircraft is cleared when issued an airport clearance, beyond which the aircraft is not authorized to proceed without further ATC clearance. When the clearance limit is the destination airport itself, the airport is the point at which the cleared route ends.
Plain English
It is the place ATC has cleared you to fly to. You are allowed to go as far as that point and no further unless they give you a new clearance. If the place named is an airport, the airport is where your cleared route ends.
Context Anchor
Used in IFR clearances, especially when ATC clears an aircraft to a destination airport rather than to a specific fix or holding point.
Derivation
Clearance' comes from 'clear,' meaning free to proceed without obstruction. 'Limit' comes from the Latin 'limes,' meaning a boundary or end point. Together it describes the boundary of what you have been cleared to do — in this case, the airport that marks the end of your authorized route.
Why Pilots Care
You may not proceed beyond this point without further clearance; reaching it without landing instructions requires holding.
Intuition Check
Do not read “limit” as just a general destination. In ATC language, it is the exact point where your current clearance authority ends unless you receive more clearance.
Example Sentence 1
ATC issued the clearance 'Cleared to Lakeview Airport,' making Lakeview the airport clearance limit.
Example Sentence 2
When the airport clearance limit was reached, the crew entered the published holding pattern to await further instructions.