The Brithis flew Gloster E28 and E29 prototype in194115th of May powered by Frank Whittle's turbojet-engine. When US learned from British work they produced XP-59 Bell with its version of Whittle engine made by he General Electric flew on 12th September 1942, that plane piloted by Col Craigie.

The first operational jet-fighter Me 262 Messerschmitt has piloted by Sir Fritz Wendell and was fastest aircraft conventional of the Word War 2, although rocket powered Me163 Messerschmitt "Komet" was fastest one. In 1944 production of mass started that was too late for decisive effects on outcome of the war, about same time United Kingdom's Gloster Meteor limited to the defense of UK against flying V1 ground and attack operators and bombs on Europe in last month of war Imperial Navy of Japan developed Jets in year 1945 including J9Y Kikka Nakajima a copy of Me-262

A jet aircraft is basically an aircraft that propelled by the jet engines and jet aircraft can fly much more faster than the propeller powered aircrafts at the higher altitude its highness is as 10,000 to 15,000 meters at about 33,000 to 49,000 ft. At this altitude a jet engine can achieve maximum efficiency over a long distance. In propeller powered engines could achieve maximum efficiency at the lower altitude. Henri a Romanian engineer was the first builder of jet plane in 1910.