Stock Photo - 14 July 2021, Brandenburg, Schönefeld: On the apron of BER ""Willy Brandt"" Airport, Holger Rasch, trainer at Wisag Aviation, explains the operation of the ""ground power unit"" (GPU) equipped with lithium-ion batteries, which can be used to supply aircraft with power while waiting at outside positions. The service provider presented the ""so-called"" Smart-Trainer, a unit for supplying power to aircraft waiting at outside positions as well as the emission-free handling of an aircraft. The ""WISAG - Ready for Green"" project is intended to help reduce CO2 emissions and thus make flying more environmentally friendly. Photo: Soeren Stache/dpa-Zentralbild/ZB. - Schönefeld/Brandenburg/Germany

Stock Photo: 14 July 2021, Brandenburg, Schönefeld: On the apron of BER ""Willy Brandt"" Airport, Holger Rasch, trainer at Wisag Aviation.

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