Virginia ? A co-worker of a woman killed in one of the Sept. 11, 2001, jetliner crashes cleared a preliminary hurdle Thursday to sit on the jury that will decide whether confessed al-Qaida conspirator Zacarias Moussaoui is executed or spends the rest of his life in prison.

For a second straight day, Moussaoui kept silent in court and closely watched the interrogation of potential jurors by U.S. District Judge Leonie M. Brinkema. Moussaoui wore a white knit cap and green prison jumpsuit.

The 37-year-old Frenchman of Moroccan descent pleaded guilty last April to conspiring with al-Qaida to fly planes into U.S. buildings, but he denied any part in the 9-11 attacks. Instead, he claimed to be training to fly a plane into the White House later.

After qualifying 14 of 22 potential jurors Thursday, Brinkema said selection was moving faster than expected.

With a total of 29 selected in two days, the judge said she might finish picking 85 potential jurors by the end of next week.