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The Bell P-59 Airacomet was a twin jet -engined fighter aircraft , the first produced in the United States, designed and built by Bell Aircraft during World War II . The United States Army Air Forces were not impressed by its performance and cancelled the contract when fewer than half of the aircraft ordered had been produced. Although no P-59s entered combat, the fighter paved the way for another design generation of U.S. turbojet-powered aircraft, and was the first turbojet fighter to have its turbojet engine and air inlet nacelles integrated within the main fuselage .