The Pentagon announced that it awarded a contract worth as much as $7.4 billion to aerospace giant Lockheed Martin Corp. to upgrade the Air Force's problem-plagued fleet of F-22 Raptor fighter jets.
The announcement said that the Bethesda, Md., company would "add new capabilities and enhance the performance of the aircraft." Lockheed referred all questions about the contract to the Air Force, which said it could not provide details about the upgrade announced Friday.
The F-22, which costs an estimated $412 million each, is the military's most expensive fighter jet and known to be its most advanced. Yet the stealthy, supersonic plane has never been used in Iraq, Afghanistan or any other combat zone since it entered service for the military in 2005.
The F-22 has experienced seven major crashes with two fatalities.
Last May, the entire fleet of F-22s was taken out of service after a dozen incidents occurred since April 2008 in which pilots' oxygen was cut off.