The Lockheed CL-1201 was a design study by Lockheed for a giant nuclear-powered transport aircraft in the late 1960s. One envisioned use of the concept was as an airborne aircraft carrier.The CL-1201 design project studied a nuclear-powered aircraft of extreme size, with a wingspan of 1,120 feet (340 m).
Had it been built, it would have had the largest wingspan of any airplane to date, and more than twice that of any aircraft of the 20th century.
The wing would be of crescent form, similar to the British Handley Page Victor V-bomber, but unlike the British design, it was tailless.Watch the video from Found And Explained for more info:
Power would be derived from the heat generated by a nuclear reactor and transferred to four jet engines near the rear, where it would superheat the air passing through to provide thrust. The craft would be capable of staying airborne for long periods of time, with an estimated endurance of 41 days. At low altitudes, the jets would burn conventional aviation fuel. In order to get airborne in the first place it required 182 additional vertical lift engines.
Two variants were studied, a logistics support aircraft and an airborne aircraft carrier. There was a rumored third variant, but information on such a model has never been made public.The logistics support variant would have a conventional heavy transport role, carrying hundreds of troops and their equipment at once.source