Yes that is correct from what I recall. I don't remember where the speeds came from as I don't believe the black boxes were ever recovered from the WTC buildings but I could be wrong on that. The claim is at the specific altitude the planes were flying, they would likely tear apart. The attack on the pentagon is similar, they found the speed and maneuvers the plane was doing were almost impossible for a Boeing 757. The air traffic controllers thought it was a military plane the way it was flying.
Yes that is correct from what I recall. I don't remember where the speeds came from as I don't believe the black boxes were ever recovered from the WTC buildings but I could be wrong on that. The claim is at the specific altitude the planes were flying, they would likely tear apart. The attack on the pentagon is similar, they found the speed and maneuvers the plane was doing were almost impossible for a Boeing 757. The air traffic controllers thought it was a military plane the way it was flying.