Crossword Genius

Where pilots will fly is not yet decided (2,2,3,3)

Ross

I believe the answer is:

up in the air

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'not yet decided' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for up in the air that I've seen before include "Where skiers go" , "skylarks singing here?" , "open to debate" , "Where skier may be seen" , "Not sure" .)

I've seen this clue in The Telegraph.
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