Zacarias Moussaoui was a clown who could not keep his mouth shut, according to his old al-Qaida boss, Khalid Shaikh Mohammed. But Moussaoui was surprisingly tame when tried for the 9/11 attacks - never turning the courtroom into the circus of anti-U.S. tirades that some fear Mohammed will create at his trial in New York.

And that wasn't the only surprise during Moussaoui's six-week 2006 sentencing trial - a proceeding that might foreshadow how the upcoming 9/11 trial in New York will go.

Skeptics who feared prosecutors would be hamstrung by how much evidence was secret were stunned at the enormous amount of classified data that was scrubbed, under pressure from the judge, into a public version acceptable to both sides.

Prosecutors were surprised when they failed to get the death penalty - by the vote of one juror.

No one was more surprised than Moussaoui himself: At the end he concluded an al-Qaida member like him could get a fair trial in a U.S. court.

"I had thought that I would be sentenced to death based on the emotions and anger toward me for the deaths on Sept. 11," Moussaoui said in an appeal deposition taken after he was sentenced to life in prison. "(B)ut after reviewing the jury verdict and reading how the jurors set aside their emotions and disgust for me and focused on the law and the evidence . . . I now see that it is possible that I can receive a fair trial."

All that suggests the dire predictions of critics and confident assertions of proponents should be viewed skeptically as prosecutors prepare to put Mohammed, the professed mastermind of the Sept. 11, 2001, attacks, and four of his alleged henchmen on trial in a civilian federal court.

The five had been headed for a military tribunal at the U.S. naval base at Guantanamo Bay, Cuba, until Attorney General Eric Holder announced last week he would charge them in civilian court and expects to seek the death penalty.

U.S. District Judge Leonie Brinkema, who presided over Moussaoui's trial - the first in this country over 9/11 - believes it proved federal courts can handle terror cases: "I've reached the conclusion that the system does work," she said in 2008.

A long process

The first lesson from Moussaoui's case: Don't expect a speedy trial.

Moussaoui was charged in December 2001 with conspiracy for his role. The case churned through years of pretrial hearings and appeals as judges sought to balance national security with Moussaoui's constitutional rights, often over what evidence could be used.

Documents later introduced at trial showed Moussaoui and Mohammed were well acquainted and Mohammed told interrogators he planned to use Moussaoui as a pilot for a second wave of hijacked jetliner attacks - plans that were eventually aborted. But Mohammed considered Moussaoui a problematic operative, who took instructions poorly and recklessly ignored directions to minimize communications.

Eventually, in 2005, Moussaoui pleaded guilty to conspiring with the Sept. 11 hijackers.

Under the complex rules for federal death penalty cases, a separate sentencing trial was held in 2006 to determine whether Moussaoui would lose his life or spend the rest of it in prison.

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