Hi Alea.....
Not according to pilots that fly 767's,Boeing
that make the planes,aircraft engineers &
engine technicians.....
Forget about whether the structure can maintain
integrity,which is highy questionable,the output of the engines is set in stone.....your average car cannot simply increase it's HP from 120hp to 1000hp at will.
As for gravity.."Baumgartner landed safely with his parachute in the desert of New Mexico after jumping out of his space capsule at 39,045 meters and plunging back towards earth, hitting a maximum of speed of 1,342.8 km/h through the near vacuum of the stratosphere before being slowed by the atmosphere later during his 4:20 minute long freefall."
As the air is 3 times denser,you in fact slow down
as you start hitting 35,000ft,20,000ft,10,000ft...
"the thrust of the engine of a diving plane is forcing the plane forwards against gradually increasing air densities rather than a continuous air density."
You are massively increasing Drag & forcing
3 times the air density through the engines...which
they are not designed to take.
i defer my answer to those that fly the planes
& those that construct the engines....
9/11 is as much a lie as weapons of mass destruction.