Answers to some of your questions are here. (www.snopes2.com)
An excerpt:
During the entire six-hour flight, Woods noticed the men neither ate nor drank. They talked to each other in whispers and did not read or sleep. On Sept. 12, Woods called the FBI to tell investigators about his experience. He was interviewed by agents on Sept. 13. Woods's spokesman told Reuters the actor thought it ''prudent not to comment on this and let the FBI continue to do their job, which they seem to be doing superbly right now.'' One of the practice flights may have occurred in August. Actor James Woods was so shaken by a flight he took from Boston to Los Angeles about a month before the attacks that he told an attendant and authorities of his suspicions when he landed. Woods was in first-class and the only other passengers in the section were four men who appeared to be Middle Eastern in origin.