YF-17 Cobra Northrop YF-23 Lockheed YF-22 Lockheed YF-12 YF-20 YF-209 YF-102 YF-73 YF-75 YF-75D YF-1 YF-77 YF-100 2007 YF 2008 YF 2009 YF YF-115 2006 YF North American YF-93 YF-90 YF-79 YF-130 YF-40 Lockheed Martin F-22 Raptor General Dynamics F-16 Fighting Falcon