Number of Pilot-Reported Near Midair Collisions (NMAC) by Degree of Hazard
KEY: R = revised, U = data are not available.
a A situation where collision avoidance was due to chance, rather than an act on the part of the pilot. Less than 100 feet of aircraft separation would be considered critical.
b An incident that would probably have resulted in a collision if no action had been taken by either pilot. Less than 500 feet would usually be required in this case.
c When direction and altitude would have made a midair collision improbable regardless of evasive action taken.
d No...