DOHA, May 15 (Reuters) - The United States is examining

the possible development of a twin-engined warplane to be known

as the F-55, as well as an upgrade to its Lockheed Martin

F-22 Raptor called the F-22 Super, U.S. President Donald

Trump said on Thursday.

Trump was speaking at a meeting of business leaders

including the heads of Boeing ( BA ) and GE Aerospace in

Doha, a day after announcing a string of business deals

including an order from Qatar for 160 Boeing ( BA ) commercial jets.