A good idea for a shot, your panning technique is also good with the aircraft appearing nice and sharp with some nice motion blur. For me though, the composition of the shot is weak. It almost feels too tightly framed (perhaps a slightly more off center composition)and I would have suggested making sure the background was less cluttered, the warehouse in the background is very distracting and also limits the sense of speed because it isn't that blurred. Perhaps there were clearer area's further along the runway?
Roger American Heavy climb and maintain a constant 8 on the judges scale!!!! Contact the winning tower on One One Niner point five! 9 here! Love the 757 buddy! Maybe I am biased as a controller!!!!