Boeing Company has won a contract worth $4bn to modernize the Royal Saudi Arabian Air Force's fighter jet fleet. According to the Pentagon, the procurement order covers conversion of 68 existing F15S jets to the new F15S-A configuration. The Pentagon added that the work is expected to be completed by December 31, 2019. Boeing will also provide for four base stand-up kits, which include spares and support equipment needed to achieve operating capability for the fighter jets. Altogether, about 150 new or converted F-15SA aircraft will be supported or maintained at four Saudi bases.