Anecdotally (the numbers won’t be out for awhile yet), there has been a sharp increase in lost baggage over the past week. This seems to an unexpected consequence of new TSA baggage screening procedures. Gate agents often put baggage tags on handles that are used to open the bag. If TSA opens the bag, the tag comes off. Lost bag.
Solution: make sure the tag goes somewhere that won’t be tampered with if the TSA decides to open it. Watch where the check-in agent places the tag, and if necessary politely ask that it be moved (“for security reasons” :).