Korea Aerospace Industries (KAI) and Hyundai Rotem said Thursday they have agreed to jointly develop and integrate long-range air-to-air missiles for the KF-21 fighter jet and explore opportunities to export aircraft and weapons packages to global markets. The two companies signed a memorandum of understanding (MOU) on airborne weapons cooperation at KAI's headquarters in the southeastern city of Sacheon on Wednesday. Under the agreement, the companies will cooperate on the development and systems integration of aircraft platforms, including the KF-21, and airborne weapons, including long-range air-to-air missiles. They will also explore package-type export models combining aircraft with onboard weapons and cooperate in identifying business opportunities at home and abroad, as well as in global marketing. The MOU signing comes as Hyundai Rotem is stepping up efforts to expand beyond ground weapon systems into the aerospace sector, including the development of propulsion systems, long-range air-to-air guided weapons and hypersonic flight vehicles. Korea formally completed the development o