Ralph has a good question.
Would the manufacturers be interested in answering it ... ?
Actually, they have.
Question: "So there is no way that a 767 could be going 500 mph at 700 ft altitude?"
Boeing spokeswoman XXXXX replies with laugh, "Not a chance".
Scroll forward to 2:57 as the first call is inaccurate
You can see more interviews with United and American Airlines 757/767 Captains, both who have actual command time in the aircraft reportedly used on 9/11, here.
Full Film - 9/11: World Trade Center Attack - Pilots For 9/11 Truth Forum