REALLY? how is it supported, that is the idea that an airliner could be flown at such speed and at such low altitude? Short of a press release from Boeing or possibly a demonstration by some hot-shot pilot who has the Chutzpah to actually attempt to fly an airliner at low altitude & that fast ..... what is offered up as proof that any of the aircraft either FLT11, FLT175, FLT77 ..... could have flown as was alleged? quoted from the link you provided, & yes, Boeing officials did remark on the fact that the speed was "off the chart" as described. so WHY should this be considered even within the range of possibility for a hijacker "pilot" to have flown the aircraft in the manner that it was alleged to have been. Indeed if it could be demonstrated that it is a physical impossibility to fly an airliner in the manner alleged for the aircraft on 9/11/2001 then this blows away the whole show. I have no doubt in my mind that it is a physical impossibility to fly an airliner at >550 mph <1000 ft altitude. and really a press release from Boeing would clear the air on this subject, but will they do it?