As nearly a million of the 80 million or so bags Delta Air Lines handles per year do not land at the same time as their owners, locating and delivering misdirected luggage costs the airline about $100 million annually.

That’s why Delta considers using disposable radio tags to track all luggage it processes at domestic airports. The airline would have to invest up to $25 million to deploy the RFID technology, but they believe the investment would quickly pay for itself by reducing luggage handling costs.

From New York Times.