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(107mm wide by 112mm deep). January 29, 2010 -- Russia has test flown its first fifth-generation jet fighter, the Sukhoi T-50. The stealthy warplane is regarded as a direct challenger to the U.S.-built F-22 Raptor, which entered service in 2005. Graphic shows key features of aircraft and comparison with U.S. F-22. KEYWORDS: Military. Airpower.