The 'Antares DLR-H2' motor glider flies over the airport in Hamburg during its first official flight July 7, 2009. [Agencies]

The 'Antares DLR-H2' motor glider rolls on the tarmac at the airport in Hamburg July 7, 2009. The motor glider is the first manned aircraft to be powered exclusively with a hydrogen fuel system. The fuel cell system is hidden in under-wing pods where the electricity for the on-board electronics and electric motor is generated. [Agencies]