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What is the best way to track down luggage lost by an airline, and to be compensated for its value? - airline baggage tags

I was booked to fly with British Airways from CDG to LAX on 07/04/07. British Airways, I was then redirected to American Airlines (due to security problems at Heathrow), with a stopover at JFK airport before arriving in Los Angeles. My bags are still missing and nobody seems to want to .. Help Forgot British Airways baggage label me ... Attempt to call and e-mail and no one seems to care about ... HELP!