The Pentagon

At 9:37 am on 9/11, 51 minutes after the first plane hit the World Trade Center, the Pentagon was similarly attacked. Though dozens of witnesses saw a Boeing 757 hit the building, conspiracy advocates insist there is evidence that a missile or a different type of plane smashed into the Pentagon.

Big Plane, Small Holes

Claim: Two holes were visible in the Pentagon immediately after the attack: a 75-ft.-wide entry hole in the building's exterior wall, and a 16-ft.-wide hole in Ring C, the Pentagon's middle ring. Conspiracy theorists claim both holes are far too small to have been made by a Boeing 757. "How does a plane 125 ft. wide and 155 ft. long fit into a hole which is only 16 ft. across?" asks reopen911.org, a Web site "dedicated to discovering the bottom line t***h to what really occurred on September 11, 2001."The t***h is of even less importance to French author Thierry Meyssan, whose baseless assertions are fodder for even mainstream European and Middle Eastern media. In his book The Big Lie, Meyssan concludes that the Pentagon was struck by a satellite-guided missile—part of an elaborate U.S. military c**p. "This attack," he writes, "could only be committed by United States military personnel against other U.S. military personnel."

FACT: When American Airlines Flight 77 hit the Pentagon's exterior wall, Ring E, it created a hole approximately 75 ft. wide, according to the ASCE Pentagon Building Performance Report. The exterior facade collapsed about 20 minutes after impact, but ASCE based its measurements of the original hole on the number of first-floor support columns that were destroyed or damaged. Computer simulations confirmed the findings.

Why wasn't the hole as wide as a 757's 124-ft.-10-in. wingspan? A crashing jet doesn't punch a cartoon-like outline of itself into a reinforced concrete building, says ASCE team member Mete Sozen, a professor of structural engineering at Purdue University. In this case, one wing hit the ground; the other was sheared off by the force of the impact with the Pentagon's load-bearing columns, explains Sozen, who specializes in the behavior of concrete buildings. What was left of the plane flowed into the structure in a state closer to a liquid than a solid mass. "If you expected the entire wing to cut into the building," Sozen tells PM, "it didn't happen."

The tidy hole in Ring C was 12 ft. wide—not 16 ft. ASCE concludes it was made by the jet's landing gear, not by the fuselage.

Intact Windows

Claim: Many Pentagon windows remained in one piece—even those just above the point of impact from the Boeing 757 passenger plane. Pentagonstrike.co.uk, an online animation widely circulated in the United States and Europe, claims that photographs showing "intact windows" directly above the crash site prove "a missile" or "a craft much smaller than a 757" struck the Pentagon.

FACT: Some windows near the impact area did indeed survive the crash. But that's what the windows were supposed to do—they're blast-resistant.

"A blast-resistant window must be designed to resist a force significantly higher than a hurricane that's hitting instantaneously," says Ken Hays, executive vice president of Masonry Arts, the Bessemer, Ala., company that designed, manufactured and installed the Pentagon windows. Some were knocked out of the walls by the crash and the outer ring's later collapse. "They were not designed to receive wracking seismic force," Hays notes. "They were designed to take in inward pressure from a blast event, which apparently they did: [Before the collapse] the blinds were still stacked neatly behind the window glass."
Flight 77 Debris

Claim: Conspiracy theorists insist there was no plane wreckage at the Pentagon. "In reality, a Boeing 757 was never found," claims pentagonstrike.co.uk, which asks the question, "What hit the Pentagon on 9/11?"


FACT: Blast expert Allyn E. Kilsheimer was the first structural engineer to arrive at the Pentagon after the crash and helped coordinate the emergency response. "It was absolutely a plane, and I'll tell you why," says Kilsheimer, CEO of KCE Structural Engineers PC, Washington, D.C. "I saw the marks of the plane wing on the face of the building. I picked up parts of the plane with the airline markings on them. I held in my hand the tail section of the plane, and I found the black box." Kilsheimer's eyewitness account is backed up by photos of plane wreckage inside and outside the building. Kilsheimer adds: "I held parts of uniforms from crew members in my hands, including body parts. Okay?"

Kilsheimer held the 757 tail section in his hand? That tail section was 55 feet tall. How big was Kilsheimer's hand?

Read the testimony of an eyewitness:

"It is as a scientist that I have the most trouble with the official government conspiracy theory, mainly because it does not satisfy the rules of probability or physics. The collapses of the World Trade Center buildings clearly violate the laws of probability and physics. ...

There was a dearth of visible debris on the relatively unmarked [Pentagon] lawn, where I stood only minutes after the impact. Beyond this strange absence of airliner debris, there was no sign of the kind of damage to the Pentagon structure one would expect from the impact of a large airliner. This visible evidence or lack thereof may also have been apparent to the secretary of defense [Donald Rumsfeld], who in an unfortunate slip of the tongue referred to the aircraft that slammed into the Pentagon as a "missile". ...

I saw nothing of significance at the point of impact - no airplane metal or cargo debris was blowing on the lawn in front of the damaged building as smoke billowed from within the Pentagon. ... all of us staring at the Pentagon that morning were indeed looking for such debris, but what we expected to see was not evident.

The same is true with regard to the kind of damage we expected. ... But I did not see this kind of damage. Rather, the facade had a rather small hole, no larger than 20 feet in diameter. Although this facade later collapsed, it remained standing for 30 or 40 minutes, with the roof line remaining relatively straight.

The scene, in short, was not what I would have expected from a strike by a large jetliner. It was, however, exactly what one would expect if a missile had struck the Pentagon. ..."