Not yet decided on flying perhaps (2,3,3)
I believe the answer is:
in the air
I believe this clue is a double definition.
'not yet decided on' is the first definition.
'flying perhaps' is the second definition.
(Other definitions for in the air that I've seen before include "like oxygen?" , "Place for a lark" , "Vaguely prevalent" , "Going about" , "Flying around currently" .)