As shown in the thread “911: Have there been more” several planes that didn’t take off on 911 gave reason to the suspicion that more hijacks had been intended. One of theses is the following case:
United Airlines Flight 23, bound from New York to Los Angeles:
“After the plane was boarded, United Airlines officials told passengers that had been cancelled.
Three males travelling refused to disembark.
The argument with a member of the flight crew became so heated that the crew member called airport security.
But before security arrived, the men had vanished, said the source,
who spoke on the condition of anonymity.“ http://www.cbsnews.com/stories/2001/09/14/national/main311250.shtmlWhen on September 13 the airport were reopened the following story happened:
Authorities detained two armed groups at New York airports yesterday, fearing they intended to hijack a pair of jetliners and mount another suicidal terrorist strike on a U.S. target, government officials said.
Both groups carried knives, false identification and open tickets to U.S. destinations dated Tuesday -- the day of the attacks on the World Trade Center and the Pentagon, sources said. They also had certificates from a Florida flight training school attended by some members of the previous hijacking teams, who were similarly armed when they commandeered four aircraft..
Jim Hunter, a passenger on an American Airlines flight scheduled to leave John F. Kennedy International Airport for Los Angeles yesterday, said officers with guns drawn stormed the flight from the front and rear at about 8 p.m. They handcuffed and removed three people after ordering all passengers to the floor. The flight was canceled. (Washington Post, 9/14/01)
http://911digitalarchive.org/crr/documents/1105.pdfAnd it is précised:
ABC reported that four of them had open tickets to various U.S. cities dated Sept. 11 one was arrested for posing as a United Airlines pilot.
(Plain Dealer, 9/14/01)
A few hours after this incident happens another:
Hours later, at LaGuardia Airport , police detained five men who also had open flight tickets, knives, fake pilot licenses and identification.
(Palm Beach Post, 9/14/01)
Starts looking like a pattern, doesn’t it?
But what’s the report between UA 23 almost being hijacked on 911 and theses two incidents on September 13? Very simple at least three persons were involved in both stories!
Law enforcement sources said three of the detained people are believed to be the same ones who quarrelled with airline workers Tuesday after being ordered off a flight to Los Angeles that had been cancelled. In that incident, the men at first refused to leave the plane, sources said. They began quarrelling with the airline workers, who called security officers. The men fled before security officers could arrive.
(Milwaukee Journal Sentinel, 9/14/01)
And here comes the big question :
Does this behaviour have clear parallels to 911?
Yes.
Was anybody involved in this incident put on trial?
No.