To provide an aircraft capable of flying by propellers and by jets, taking off and landing like a helicopter without requiring a long runway or a large site, reducing noise, flying without using natural resource fuel, changing a flying system into a jet device at a proper altitude after tanking off.

This aircraft is provided with a propeller device 3 comprising plural rotary propellers 2, an aerial injection jet device 16 comprising a spiral screw, a compressed air receiving and storing regulation chamber 18, an ion supply device, and a combustion chamber to feed compressed air into the compressed air receiving and storing regulation chamber 18 to mix the compressed air with ions supplied by the ion supply device in the combustion chamber to form a jet current which is injected into open air, a jet injection device D, and a compressed air storage chamber 33.