The Sukhoi PAK FA (Russian: Перспективный авиационный комплекс фронтовой авиации, Perspektivny aviatsionny kompleks frontovoy aviatsii, literally "Prospective Airborne Complex of Frontline Aviation") is a twin-engine jet fighter being developed by Sukhoi OKB for the Russian Air Force. The Sukhoi T-50 is the prototype for PAK FA.^[12] The PAK FA is one of only a handful of stealth jet programs globally.^[13]
The PAK FA, when fully developed, is intended to be the successor to the MiG-29 and Su-27 in the Russian inventory and serve as the basis of the Sukhoi/HAL FGFA being developed with India.^[14][15] A fifth generation jet fighter, the T-50 performed its first flight 29 January 2010.^[3][16] Its second flight was on 6 February and its third on 12 February 2010. As of 31 August 2010, it had made 17 flights and by mid-November, 40 in total. The second prototype was to start its flight test by the end of 2010, but this was delayed until March 2011.^{[17][18][19][20][21]}

Sukhoi director Mikhail Pogosyan has projected a market for 1,000 aircraft over the next four decades, which will be produced in a joint venture with India, 200 each for Russia and India and 600 for other countries.^[22] He has also said that the Indian contribution would be in the form of joint work under the current agreement rather than as a joint venture.^[23] The Indian Air Force will "acquire 50 single-seater fighters of the Russian version" before the two seat FGFA is developed.^[24] The Russian Defense Ministry will purchase the first 10 aircraft after 2012 and then 60 after 2016.^[25][26] The first batch of fighters will be delivered with current technology engines.^[27] Ruslan Pukhov, director of the Centre for Analysis of Strategies and Technologies, has projected that Vietnam will be the second export customer for the fighter.^[28] The PAK-FA is expected to have a service life of about 30–35 years.