The Pentagon says one company was solicited for the contract and one firm submitted a proposal, which suggests only Lockheed vied for the lucrative contract.
Earlier this year, the Air Force temporarily grounded its entire fleet of Raptors for more than four months after concerns over its oxygen-supply system had prompted a larger examination of the stealth fighter.
The Air Force returned its Raptors to flight in September.
Shares of Bethesda, Md.-based Lockheed ended regular trading down 6 cents at $75.10.
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