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.

Trump referred to the proposed F-55 as both an upgrade to

the Lockheed Martin F-35 and a separate new development.

He also highlighted the role of a new air dominance platform

called the F-47, recently awarded to Boeing ( BA ), and said the

United States was simultaneously looking at upgrading the

stealth fighter it is designed to replace, the F-22.

"We're going to do an F-55 and - I think, if we get the

right price, we have to get the right price - that'll be two

engines and a super upgrade on the F-35, and then we're going to

do the F-22," Trump said.

"I think the most beautiful fighter jet in the world is the

F-22 but we're going to do an F-22 Super and it'll be a very

modern version of the F-22 fighter jet."

Trump's comments came weeks after he awarded Boeing ( BA ) the

contract for the F-47 - a replacement for the F-22 stealth

fighter featuring a crewed aircraft flanked by drones and seen

as America's most advanced or sixth-generation fighter.

Analysts said it was not immediately clear how Trump's list

fitted into a jigsaw of known programmes or spending plans.

Agency Partners aerospace analyst Nick Cunningham said the

F-55 may refer to the F/A-XX programme, intended to replace the

U.S. Navy's Boeing F/A-18 Super Hornet fleet during the 2030s.

The Navy and Congress are battling with the administration

to keep the plans moving forward, Reuters reported on Wednesday.

Any significant upgrade to the out-of-production F-22 would

be costly, while Trump's reference to two engines implies the

F-55 would not be closely related to the single-engined F-35, he

said.

Lockheed Martin ( LMT ) is in the midst of a delayed software

upgrade for the F-35 to boost displays and processing power.

CEO James Taiclet also told analysts last month that

Lockheed was looking at ways of applying co-funded technology

that was developed for its losing bid for the F-47 contract to

the F-35, delivering 80% of the capability for half the cost.

(Reporting by Andrew Mills, Nayera Abdallah, Tim Hepher;

Editing by Alex Richardson and Ros Russell)