Trump said Boeing had won the contract to build the U.S. Air Force's next generation of fighter jets. Little is known about the jet's specifications, appearance or capabilities.

Shares of Boeing rose nearly 5% after the U.S. company beat out Lockheed Martin LMT.N for the deal. Lockheed's shares fell nearly 7%.

Boeing won a contract March 21 to develop a next-generation combat aircraft for the U.S. Air Force that will spearhead future air wars and throw a lifeline to the company’s struggling military aviation business.