Runway tractor pushing Boeing 777-200 aircraft at Frankfurt Airport - Stock image
Air Vehicle, Airplane, Airport, Airport Runway, Boeing 777-200
Frankfurt, Germany - April 22, 2011: A runway tractor is pushing a Continental Airlines Boeing 777-200 aircraft into position at Frankfurt Airport, Germany. The pilots are undertaking last checks. Aircraft cannot drive in reverse, which is why runway tractors are used to leave the airport gates. Frankfurt Airport is Germany's biggest airport.