The Aero Vodochody L-39C “Albatross” is a tandem two-seat single-engine jet trainer operating under an Experimental Airworthiness Certificate. It was developed to train pilots for Eastern Block MiG, Sukhoi and other aircraft. The aircraft is powered by a single AI-25TL, non-afterburning turbofan engine, generating a maximum of 3,800 lbs of thrust. The L-39 has a maximum takeoff weight of 10,380 lbs. The NTPS L-39s are used for Performance and Flying Qualities flight test instruction.