That is an aircraft designed to transport nuclear bomb safely to the area to be dropped. The first nuclear capable aircraft used in history was a B29 bomber named Enola Gay which was modified to carry the nuclear artifact.
During the Cold War aircraft carriers had a secondary mission of nuclear warfare and its attack aircraft were nuclear-capable. However, it was policy to neither confirm nor deny the presence of nuclear weapons aboard any naval vessel. Pres. George H.W. Bush cancelled the nuclear mission for all naval forces except SSBN submarines. Today there are no nuclear weapons and no nuclear-capable aircraft on our carriers.
The B-36 was a long range combat aircraft. It had the largest wingspan of any combat aircraft. It was solely operated by the United States Air force. It was capable of delivering and bombing nuclear warheads.
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A spacecraft is any man made object capable of reaching space. An aircraft is any man made object capable of flight.
Aircraft built by the military to refuel other capable aircraft (other military craft basically) in midair.
The U.S.S. Enterprise, CVN-65, was the first nuclear powered aircraft carrier. A link is provided.
There are currently no aircraft capable of flying mach 5. The fastest ever flown was mach 3.1 by the SR-71 Blackbird.
Same as nuclear gravity bombs dropped by bomber aircraft.
Nuclear plants are too heavy, because of the shielding required
Enterprise
They made aircraft because nuclear submarines had not yet been invented.
Two nuclear-powered aircraft have been tested, but none have been placed in series production or service. The two aircraft are now out of service. They used to belong to the United States and the USSR.