The Goldhofer AST-1 X 490 and AST-1 X 680 represent the innovative upgrade of the proven AST-1 F/L aircraft tractor by extending the aircraft range up to the B747-8 and A380. The tractors tow aircraft up to 1,32 million pounds. Engine output is 490 PS or 680 PS. Max. NLG load: 108,000 pound-feet.