The Sukhoi Su-57 (Russian: ????? ??-57; NATO reporting name: Felon)[5] is a twin-engine stealth multirole fighter aircraft developed by Sukhoi.[6] It is the product of the PAK FA (Russian: ??? ??, short for: ????????????? ??????????? ???????? ????????? ???????, romanized: Perspektivnyy Aviatsionnyy Kompleks Frontovoy Aviatsii, lit.?''prospective aeronautical complex of front-line air forces'') programme, which was initiated in 1999 as a more modern and affordable alternative to the MFI (Mikoyan Project 1.44/1.42). Sukhoi's internal designation for the aircraft is T-50. The Su-57 is the first aircraft in Russian military service designed with stealth technology and is intended to be the basis for a family of stealth combat aircraft.