The NYT are reporting that the FBI were given millions of passenger records by airlines in the says after the September 11th tragedies. Seems like a pretty sensible course of action for the FBI to request such records given the circumstances. They used subpoenas, so it was all above board. The only question, I guess, is regarding the boundaries of the request and the quantity of information handed over. Apparently at least one airline provided a year's worth of records.