The invention relates to a multifunctional modular aircraft comprising a first body including the nose, the cabin (2), the engines (3), the wings (4) and the rudder (6) of the aircraft, and an upper fuselage (5). The aircraft also comprises at least one interchangeable module (1) that can be coupled below the upper fuselage (5) and solidly connected thereto and disposed between two pillars (7) extending vertically downward from the upper fuselage (5) with the landing means (train, skids, etc.). The module can be amphibious or can include motorised, retractable wheels (8) or parachutes in order for the module to be released in flight. For example, the module can be a seaplane module for fighting fires, or used for cargo, passengers or humanitarian aid, or serve as a field hospital, or for military transport, transport of goods, cold storage, aerial assaults, bombing, or used as a personnel carrier. The cargo compartment can be formed by a lifting platform (9) that can move from a position in which it is positioned against the fuselage.
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