 Based upon an estimated takeoff weight of 49 @,@ <unk> pounds ( 22 @,@ 265 kg ) , the manufacturer calculated a speed of 138 knots ( 159 miles per hour or 256 kilometers per hour ) and a distance of 3 @,@ <unk> feet ( 1 @,@ 141 m ) would have been needed for rotation ( increasing nose @-@ up pitch ) , with more runway needed to achieve lift @-@ off . At a speed approaching 100 knots ( 120 mph ) , Polehinke remarked , " That is weird with no lights " referring to the lack of lighting on Runway 26 – it was about an hour before <unk> . " Yeah " , confirmed Clay , but the flight data recorder gave no indication either pilot tried to <unk> the takeoff as the aircraft accelerated to 137 knots ( 158 mph ) . 
