Supply system and method for energy supply in an aircraft

A supply system (100) for the energy supply in an aircraft comprising an engine (101) for propelling an aircraft, a fuel cell (102) for supplying an aircraft with electric energy, a first fuel reservoir (103) for supplying the engine (101) with engine fuel and a second fuel reservoir (104) for supplying the fuel cell (102) with fuel cell fuel. The first fuel reservoir (103) is arranged separately of the second fuel reservoir (104).