Fuck your bullshit.

I think the real question here is if a 767 frame can withstand these speeds at seal level, not if the engines can propel the plane at such speeds. I'm not an engineer, but I can easily imagine a prolonged linear decent putting the ground speed at the levels mentioned. Especially if the plane was flying with a tailwind.

Outside of that, I'm not sure it matters if it was a plane/missile/nuke/dildo. A projectile brought down buildings meant to withstand an impact of far greater magnitude. 9/11 is beyond suspicious, but I think people are looking for an explanation in the wrong places. It would be a far smaller job to rig a building for demo, than it would to: fire missiles, edit/suppress all videos, and disappear 2 real 767's with tons of documented flights. For the no-planes theory to be correct, airlines would have to be in on this. And if airlines were a part of the conspiracy, it would be far easier to rig 2 planes with high-thermal fuel-air bombs, refitted with the larger engines needed for such speeds.

Max air speed @ 35000 feet != max airspeed at sea level. physics > politics.