In July 2006, a Scripps Survey Research Center poll found that 12 percent of Americans “suspect the Pentagon was struck by a military cruise missile in 2001 rather than by an airliner captured by terrorists.”

This mistaken belief is largely based on the fallacy that the attack on the Pentagon created a small hole consistent with a cruise missile strike, rather than a large hole, as a commercial airliner would make. The wildly popular conspiracy theory video Loose Change made this mistake, among many others.

But the “small hole” was really a large hole, most of which was obscured by fire-fighting foam during the 19 minutes between when the airliner struck the Pentagon and when that section collapsed, forever obscuring the impact site. See this State Department photo gallery for selected photos of the Pentagon on 9/11.

Also, the remains of the 64 passengers on the plane were found at the Pentagon crash site. 184 of the 189 people who died in the attacks (64 on the plane and 125 in the Pentagon) were identified by DNA analysis. In addition, massive amounts of plane debris were found at the site. More than 100 eyewitnesses reported they saw a plane.

See the Pentagon page of Links for 9/11 Research for a wealth of information debunking this conspiracy theory.