Do we know that the pilot deliberately killed himself and everyone else?
If he did, what can be done to prevent this in the future?
If not, I'd look to see who had access to the plane at its originating airport (Paris?). I hear some of the airports have security issues. Maintenance, baggage handlers, cleaning crews, fueling personnel, food service - all had direct contact with the aircraft before its last flight.
Passengers: was there anyone on board that someone needed to get rid of? How about a passenger who loaded his luggage, then missed the flight?
I do suspect this was a terrorist act, but not ready to blame the pilot yet.
Do you mean a passenger who had his luggage loaded on the plane, or loaded his carry-on luggage and went of the plane again for some reason and missed the plane?
Any muslimes associated with the flight, as in pilot or crew or ground servicing? If so, that is a good place to start. . .muslimes.
A few years back, pre-911, I was a regular traveler to Cairo. IAD-LHR-CAI (Brit Air). The day of my departure I would take a hotel limo to the airport, then my escort would take my bags (carry-on only) and passport and we would moon-walk past screening and the ticket counter and passport control, and he would drop me and my bags at the executive lounge. He would then go to the ticket counter and get me checked in and get my ticket and bring it to me. My bags were never inspected nor did I see an immigration guy. Cost? About $40 US.