a relatively light aircraft flown by a bush pilot and used to carry freight and passengers to isolated points in the northern bush and barrens and usually equipped with pontoons or skis.
1953  Pilot Johnny Dapp made the trip in a ski-equipped bush-plane. . . .
1965  . . . that's a mighty large hunk of flying time, especially when it's piled up in bush planes, where you can't lock the aircraft on the beam. . . .