WorldTracer is a SITA / IATA service provided for the tracking of lost or delayed baggage.
WorldTracer operates globally and can exchange information with 2800+ member airports.
The World Tracer internet interface allows passengers to track their bags by entering a transaction number.
Whenever an on-hand produces a likely match, the station that registered the missing bag file receives an alert.
The tracking number format is AAABBNNNNN, where AAA is the airport's IATA code, BB is the airline's IATA code and NNNNN is a 5-digit tracking number.