Crossword Genius

Restricted airspace (2-3,4)

Ross

I believe the answer is:

no-fly zone

(Other definitions for no-fly zone that I've seen before include "Area banned to aircraft" , "Airspace in which (military) planes are forbidden" , "Airspace where no aircraft can go" , "'Forbidden airspace (2,3,4)'" , "Area over which aircraft are forbidden" .)

I've seen this clue in the Sydney Morning Herald.
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