Aircraft Visibility over Enemy Territory

If an enemy patrol is over your territory where you have no units in range can you see the patrol?

Does it make a difference if the patrol is centred on your territory, or if it is centred off your territory but overlapping?

Does it make a difference if the patrol is centred on your territory but not overlapping a province dot?

Can you see planes flying over your territory when they are en route to a patrol spot, an attack run, either on your territory or over it and out the other side? Or if they are crossing your territory to relocate? <---- all assuming you have no units in range to see them.

Does any of the above change if the aircraft in question are neutral and not enemy?

I would assume even without proper military units in range, civilians or Dad's Army would be on the phone to report incoming aircraft, but unsure how the game implements it.