Helicopters, Autogyros, balloons and airships are all aircraft without wings. The thing about aircraft as a word is it just means a vessel (craft) that travels in the air.
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Regarding an aviation accident, a ghost plane or ghost flight occurs when the plane, already in the air, suffers some type of accident that has incapacitated the crew and passengers but continues to fly until it runs out of fuel and crashes.
A ghost flight has no formal definition but is generally considered to be a flight that operates on less than 10% passenger capacity. With aviation's environmental footprint under close scrutiny, it is understandable that the issue of such flights has been getting attention.
Pilots with useful vision in only one eye may obtain medical certification upon demonstrating the ability to compensate for the loss of binocular vision and to perform airman duties without compromising aviation safety.