1950 .... Convair B-36 'Peacemaker'

... the first true 'Intercontinental Bomber': built for the USA's Strategic Air Command the B-36 was designed during WW2- when fears that England would fall to the Nazis prompted dreams of a bomber that could fly to Europe and back non-stop! 

Expensive, temperamental and increasingly vulnerable to Soviet fighters it was replaced in the late 1950's by jet bombers that could be refueled in flight.

... the AV Kid never passes up a chance to 
post this clip from his favorite Jimmy Stewart movie!