The Pentagon No-Jetliner Theory

Attack Plane Maneuvers

Attack plane executed a 270-degree spiral dive, losing 7000 feet in 2.5 minutes.
Approached Pentagon from southwest on low angle (< 10 degrees)

Air Traffic Controller Danielle O' Brien:

The speed, the maneuverability, the way that he turned, we all thought in the radar room, all of us experienced air-traffic controllers, that that was a military plane.

Often omitted:

You don't fly a 757 in that manner. It's unsafe.

Distinct questions:

Was attack plane piloted by Hani Hanjour?
Was attack plane a Boeing 757?