Who screens the security?
Some years back a SAUDIA B777 was hijacked enroute to Europe and diverted to Iraq. The hijackers were security personel from JED Airport.
An attempt was stopped by security in Algiers, when the head of airport anti terrorist unit was going to hijack a B747. He was found hiding in the cargo compartment.
All this was before sept 11th.
However one wonders with some places.