Posted by John McHaleMARIETTA, Ga., 29 Oct. 2010. Lockheed Martin [NYSE: LMT] F-22 Raptor 4168 flew from the company's Marietta facility on its delivery flight to Langley Air Force Base, Va. Raptor 4168 is the 15th F-22 delivered to the U.S. Air Force this year, the 168th overall. Lockheed Martin has delivered 88 consecutive F-22s on or ahead of schedule.Two squadrons of F-22s are assigned to Air Combat Command's 1st Fighter Wing at Langley AFB. Two squadrons also are assigned to the 3rd Wing at Elmendorf AFB, Alaska. Raptor pilots and maintainers train at Tyndall AFB, Fla., while operational flight testing is conducted at Edwards AFB, Calif., and Nellis AFB, Nev. New F-22s continue to roll from the production line and will soon operate out of Holloman AFB, N.M., and Hickam AFB, Hawaii.