C-21

The C‑21 is a military transport aircraft derived from the civilian Learjet 35A, built by Learjet (now part of Bombardier) for the United States Air Force. First delivered in 1986, the type was introduced to replace the aging C‑119 and C‑123 cargo planes used for short‑range personnel and cargo missions. The airframe retains the sleek, twin‑engine, low‑wing design of the Learjet 35, powered by two Garrett TFE731‑3 turbofan engines that give a cruise speed of roughly 470 knots and a range of about 2,000 nautical miles. The cabin can be configured for up to 13 passengers, a medical evacuation layout, or a VIP transport arrangement, and the aircraft is equipped with a cargo ramp, heated/air‑conditioned interior, and a robust communications suite suitable for command and control flights. Its modest size, high speed, and ability to operate from short runways have made it valuable for rapid movement of senior officials, small cargo loads, and aeromedical evacuations. The C‑21’s continued service underscores the versatility of the Learjet platform and highlights the importance of adaptable, jet‑powered utility aircraft in modern military logistics operations.

Learjet

Classification

Design & Classification