it's always a weak argument that puts words in someone's mouth and starts talking about egos and needs a lot of exclamation points and capital letters.
the engineer talks about break up velocities.
the faa and boeing talk about maximum operating velocities.
apples and oranges. the engineer is not in dispute with boeing and the faa. and nor am i. indeed, you are in dispute with them. they believe the commercial jets flew into the towers.
yes, your argument depends on establishing break up speeds to generate the conspiracy. mine doesn't. i know what happened on 9/11. commercial jetliners flew into the world trade centre. i have the evidence of witnesses. thousands and thousands of them.