So yesterday, on the 10th anniversary of 9/11, F-16's were scrambled to shadow two flights that had observed "suspicious activity in the restrooms."  In one flight, three men were detained who made several trips to the restroom and were believed to be giving each other hand signals. The three were released without being charged.

On the second flight, two people spent a suspicious amount of time in the restroom.  Subsequent investigations revealed that the couple were just joining the "mile high club."  LOL