And Then There Were Four T-50s In The Air

The Russian answer to the American F-22, the T-50 (or PAK-FA) now has four prototypes in operation. The fourth one made its first flight on December 12th. The T-50 flew for the first time in January 2010. Six more prototypes are on order and, if all goes well the first 60 production models will be ordered in 2015 and be delivered by the end of the decade.

See the full article at Strategy Page