I believe the threat is real. Thanks having the presence of mind and intestinal fortitude to do research and come to a different conclusion! If you come up with something not linked to,... be my guest.
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However, American Airlines flight 621 does not fly into LAX. It goes from ORD (Chicago) to DFW (Dallas Fort Worth) to SNA (Orange County - John Wayne International).
To further complicate any investigation, a review of Passur data for Orange County Airport finds that data is unavailable for the time period when AA 621 would have been landing. Flight data is available for the days immediately preceeding and immediately following the reported incident.
A check of several fee-based systems shows the same missing time period. When I called American Airlines, I was told that flight data was not available from them either for that flight on November 27.
http://www.lauramansfield.com/j/112905_missiles.asp