Korean Air, South Korea\'s top air carrier, said Monday that it has won an order worth 400 million U.S. dollars from the U.S. Air Force to improve performance of F-15 fighter jets. Under the deal with the U.S. Air Force, Korean Air will conduct performance improvement processes and aircraft condition inspections on 60 F-15 fighter jets stationed in the Pacific region by 2016. Korean Air has successfully carried out projects for repairing and improving fighter jets and helicopters of the U.S. Army, Navy and Air Force. It has repaired some 530 F-15 fighter jets of the U.S. Air Force since 1983, serving as a central facility needed for the U.S. Air Force to maintain combat strength in the Pacific region.