One would always think it almost impossible, with 2 airplanes that one or the other was paying attention to airspace.
But humans are not perfect and things do happen.
Its still more dangerous to drive to the airport rather than fly... IMHO.
That's the conventional wisdom comparing commercial flying vs. POV.
Much higher in small fixed-wing aircraft than commercial. Don't know how it compares with POV travel though, but obviously closer if not exceeding it.
