Lockheed U-2- 1956 ~ in service
- United States Air Force (USAF)
- high altitude reconnaissance aircraft
- U-2A - Initial production, single-seat; Pratt & Whitney J57-P-37A engine; 48 built
- U-2C - upgraded single-seat model with Pratt & Whitney J75-P-13 engine
- U-2R - re-designed airframes enlarged nearly 30 percent with underwing pods and increased fuel capacity; 14 built
- TR-1A - upgraded U-2R for high-altitude tactical reconnaissance missions with side-looking radar, new avionics, and improved electronic countermeasures (ECM) equipment; 33 built.
- TR-1B - Two TR-1A were converted as 2-seat trainer
- TU-2S - upgraded TR-1B two-seat trainer with improved engine (5 converted)
- U-2S - upgraded TR-1A & U-2R with updated General Electric F118 engine, improved sensors, and addition of a GPS receiver; 31 converted
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