There is a modifier in the 'airstrike cfg' file that changes the possibility of attacks at night. In the vanilla game it is quite high. I've changed mine down slightly. While I don't think it is possible to entirely eliminate air attacks at night you can certainly make them pretty rare.
Problem is, I don't think there is any way to differentiate between and radar-less early war aircraft and a late war radar equiped version.
Carriers will launch air patrols as well. If you come into their range and the logic call is made, they will come at you, same as regular air bases. I seem to remember from SH3 they had very high ranges.
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