I found BurbankKarl's reply to your thread of yet another incident that I've taken the liberty to bring over here.
BurbankKarl - Was talking with a buddy about an incident that happened here in Socal last month. The original call came in as an in-flight emergency, where all the PD units at airport were notified about suspicious circumstances on a 737. The plane was 10 minutes out, so there was some talk between the PD and the FAA (tower) about what was going on. Anyway, the plane landed and the police detained and questioned five "middle-eastern" males. What apparently happened was that the five guys were all flying on one-way, last minute tickets. All paid cash. All had no bags. All were sitting in different seats on the plane...but they kept looking at each other during the flight. When the captain put on the seat belt signs, all five got up to use the bathroom....that is what freaked out the head flight attendant. Anyway, all five (with five different state drivers licenses) were checked out against NCIC (Fed Computer) and came back clear....the airport PD also recorded the license plates of the cars that picked each of the guys up, and forwarded the information to the DOJ.
Thanks for bringing BurbankKarl's post over. I had not reread the entire thread so I had forgotten about that. Chilling.