The United States' entry into World War Two brought into production an unprecedented number of innovations across the entire range of military hardware. Aircraft concepts that had hitherto been nothing more than drawing-board ideas were soon the subject of serious consideration. The pre-war proliferation of twin-engine, medium-range airlifters was to be complemented by more capable transports, able to deliver men, equipment, supplies and all manner of wartime materiel with intercontinental range. There was a requirement to span the Atlantic and Pacific Oceans, with the minimum of refuelling stops.
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