51 of the pilot compartment 52 during a first step fig6 of folding of the inventive aircraft the stabilizers 6 are turned about their horizontal longitudinal hinges 18 upwardly so as to assume a vertical position and surround the fin 7 with the rudder 8 then the thus folded tail part 5 is turned as a whole downwardly about a horizontal transverse hinge 19 a back 20 of a pilot seat is turned forwardly about a horizontal transverse hinge 21 so as to assume a horizontal position on the frame 51 during this first folding step the wings 2 which are composed of a plurality of telescopable wing parts are folded by displacement of the telescopable wing parts in a horizontal transverse inward direction toward the fuselage boom 1 during a second step fig8 of folding of the aircraft the fuselage boom 1 which is composed of at least two telescopable parts 1 39 and 1 34 is folded by displacing the part 1 34 inwardly into the part 1 39 the pilot compartment forming means include upright members 22 23 24 and 25 connecting the frame 51 with the fuselage boom 1 and particularly with its part 1 39 the member 22 is connected with the fuselage boom and the frame by horizontal transverse hinges 26 and 27 the member 23 is connected by a horizontal transverse hinge 28 with the frame and by releasable means 29 for example a pin and a hook with the wing 2 the member 24 is connected by.