Over 1 million pages of documentation detailing the airlines' and security companies' handling of the 9/11 terrorist attacks will remain secret, a judge indicated yesterday. The motion to make the documents public was filed by three families of victims who died that day; according to the Daily News they are the last remaining holdout families out of nearly 100 who chose to pursue litigation against the airlines rather than accept a settlement. In suggesting that he will rule against the motion, Judge Alvin Hellerstein said his immediate goal is to set a trial date for the families, and forcing the turnover of the documents would only delay that process. But the families are hoping the trial will expose the airline industry's negligence in failing to stop the hijacking. Plaintiff Michael Low's daughter was a flight attendant on American Airlines Flight 11, which hit the north tower; she relayed the seat numbers of the hijackers to the ground so federal agents could identify them. He tells the Post, "This just didn't happen because the 19 thugs were so smart. Some of them were terribly inept."