What is "lighter-than-air craft"

Usage examples of "lighter-than-air craft".

Cavilla had simply showed up one day, impressed LeBaron with his expertise in lighter-than-air craft, and was hired.

Hitherto the besieging forces, although they knew of the fact that Paraquil possessed a huge lighter-than-air craft, were under the impression that either she was unfit to fly or else her crew lacked sufficient confidence and capability to take her up.

Already he had unleashed on Tatir the wheel and lighter-than-air craft.

The lighter-than-air craft was much more subject to being swept off its course than would have been a heavier plane.

That airplanes could not be used and lighter-than-air craft were too vulnerable?

It has to be a lighter-than-air craft of at least five hundred thousand cubic feet to reach that altitude.