All 9/11 conspiracy theories are implausible...

ESPECIALLY the official one. Xymphora links to a CNN transcript from September 14, 2001. Kelli Arena reads from a list she just received from a Justice Department source of the 18 (not 19) suspected 9/11 hijackers. Included among the five on American Airlines flight 77, which is alleged to have hit the Pentagon, was Mosear Caned (phonetic spelling). Missing from that list is Hani Hanjour, who according to the official story was the hijacking pilot on flight 77. None of the five on Arena's list had apparently had any pilot training whatsoever. Xymphora suggests that Caned's name was removed and Hanjour's inserted because Hanjour had been to flight school. Unfortunately for the official story, Hanjour was an incompetent pilot by all reports, and the manuevers made by flight 77 or whatever hit the Pentagon suggested a highly-skilled, experienced pilot.

Xymphora concludes:

Nothing linked any of the names to terrorism except for the fact they were Arab-sounding names on the manifest. The addition of "Mosear Caned"/Hani Hanjour shows us how crudely this was done. They needed a pilot on Flight 77, so they just picked another Arab-sounding name off the list, and then likely substituted the name of semi-plausible pilot Hani Hanjour when someone pointed out that "Mosear Caned" was a dangerous name to have on the list. The FBI simply backtracked from the names to determine the identities. Since most, if not all, of the September 11 hijacker identities were stolen, we remain in the dark as to who really was behind September 11. Given the fact that the United States has completely shredded its Constitution and fought two disastrous wars on the basis of a theory of who was behind September 11, this is rather amazing.

Actually, I would replace the phrase "on the basis of a theory of who was behind September 11" with "using September 11 as an excuse." The wars were already planned, awaiting only a New Pearl Harbor. The links to Afghanistan were flimsy (there was a guy there who certainly would have liked to pull off something like 9/11), while the links to Iraq existed only in William Safire's fevered mind. But we don't know who the hijackers actually were or who actually supported them. As Xymphora points out (and I have before), FBI director admitted as much in April of 2002:

The hijackers also left no paper trail. In our investigation, we have not uncovered a single piece of paper – in the U.S. or in Afghanistan – that mentioned any aspect of the September 11th plot.