If you happen to lose an item during a Delta flight, there are two ways to report it. You can either use the Delta Lost and Found online form to submit a report, or you can directly speak with the airport personnel at the Delta baggage service counter. It is important to provide detailed information about the lost item(s), including descriptions, locations, dates, and flight numbers. Reporting the lost item(s) as soon as possible will increase the chances of a quick recovery.