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Feb. 15 (UPI) — Boeing was awarded a $219.6 million contract to work on new fuel tanks for the U.S. Navy’s fleet of F/A-18 Hornets.

The design, development, testing and integration of the fuel tanks will take place through July 2022 in El Segundo, Calif., St. Louis, Patuxent River, Md., and Philadelphia, the Defense Department announced on Wednesday.

Just under $19 million was obligated from fiscal 2018 research, development, test and evaluation funds by the Naval Air Systems Command in Patuxent River, who is the contracting authority.

The Hornet is a twin-engine supersonic combat jet designed by McDonnell Douglas and Northrop, and went into active duty in 1978. McDonnell Douglas and Boeing merged in 1997.

Conformal fuel tanks are extra tanks closely fit to the side of an aircraft that extend their range while less of an effect on their aerodynamic abilities than external drop tanks.