Russian Air Force Receives 2nd T-50 Stealth Fighter Prototype

The second T-50 prototype was delivered to the Russian Air Force for flight testing.
The first T-50had been delivered to a military airfield in Russia’s southern Astrakhan region for test flights.
Russian Air Force combat squadrons could expect deliveries of the production version of PAK-FA in 2016 at the latest.
Sukhoi has been conducting its own test flights of several of the aircraft since 2010, including in-flight refueling and high-agility maneuvers. The company said in October that these had produced favorable results.
ria.ru