German airline Lufthansa has reduced its domestic flight schedule to cut costs, which include high fees at the country’s airports, chief executive Carsten Spohr has said. Due to the high fees at German airports, Lufthansa is increasingly using its aircraft “more efficiently and profitably on other European routes,” Spohr told dpa. The carrier had also expanded cooperation with German railway operator Deutsche Bahn, the chief executive said. Lufthansa and Deutsche Bahn have been offering a so-called Rail&Fly deal for years, with airline tickets for international flights including a train ride t…