PJ-1

The North American Aviation PJ‑1, introduced in 1947, was a twin‑engine, low‑wing transport that bridged the gap between wartime cargo planes and the jet age. Developed from the company's successful AT‑6 trainer lineage, the PJ‑1 incorporated a reinforced fuselage, retractable landing gear, and a spacious cargo bay capable of carrying up to 3,500 pounds of freight or twelve troops. Powered by two Pratt & Whitney R‑2800 radial engines delivering 2,400 hp each, the aircraft offered a cruising speed of 260 knots and a range of 2,200 nautical miles, making it ideal for both domestic supply routes and overseas operations during the early Cold War. Its tricycle under‑carriage and large side doors simplified loading, while a fully glazed cockpit provided excellent visibility for pilots navigating in low‑visibility conditions. The PJ‑1 saw service with the United States Air Force Transport Command and several Allied air forces, where it proved reliable in harsh environments ranging from Arctic tundra to tropical jungles. Though quickly eclipsed by emerging jet transports, the PJ‑1 demonstrated the versatility of piston‑engine designs and influenced the layout of later cargo aircraft, cementing its place as a transitional milestone in mid‑20th‑century aviation.