I've been looking into this whole "it was a missile that hit the Pentagon" theory, and I'm not so convinced any more. There was a group of National Geographic bigwigs on flight 77 that hit the Pentagon. The news reports the day after on September 12, 2001, record that they died.

The "missile theory" doesn't account for the dead. Although I've heard crazy nutjob claims like "there never was a flight 77" and "flight 77 landed and the government killed them." *eyeroll*