The aircraft (1) has a rotating element (10) provided with blades (11) that come into contact with a liquid surface during sea landing. A shroud (15) partially surrounds the rotating element and comprises a float (20) that is inflatable by a buoyancy system to prevent the blades from making contact with the liquid surface in an inflated position. The shroud comprises a lower portion (16) that faces ground when the aircraft rests on the ground. An inflation unit (50) deploys the float into an inflated position before a landing position. The rotating element is designed as a standard rotor or a propeller.