The T-43A is a medium-range, swept-wing jet aircraft. Equipped with modern navigation and communications equipment to train navigators for strategic and tactical aircraft, the T-43A is primarily used in the Air Force's undergraduate navigator training program. Several T-43s are configured for passengers and provide operational support to assigned commands and the Air National Guard. The T-43A is the Air Force version of the Boeing 737 transport. One jet engine is mounted under each wing. The exterior differences between the military and commercial aircraft include the addition of many small blade-type antennas, sextant ports, a wire antenna for high-frequency radio and fewer windows. The aircraft has considerably more training capability than the plane it replaced, the T-29C. Inside each T-43A training compartment are two minimum proficiency, two maxiumum proficiency and 12 student stations. Two stations form a console, and instructors can move their seats to the consoles and sit beside students for individual instruction. The large cabin allows easy access to seating and storage, yet reduces the distance between student stations and instructor positions. The student training compartment is equipped with advanced avionics gear identical to that of Air Force operational aircraft. This includes mapping radar; VOR (VHF omnirange) and TACAN (tactical air navigation) radio systems; inertial navigation system; radar altimeter; and all required communications equipment. Five periscopic sextants spaced along the length of the training compartment are used for celestial navigation training.