Today at the Fresno airport I had the interesting experience of being told by the Delta/Sky West ticketing agent that I had a seat assigned on the flight to Salt Lake City but no ticket.  He seemed fairly flummoxed by the situation and as he started typing furiously to try and find the lost ticket (who knew one could get a seat without one?) I mentioned that I had been rerouted several times in the past few months for this vacation. But since I hadn’t brought any of the Northwest emails, we had no ability to trace the changes. The agent finally retrieved the ticket when I mentioned that one of the rerouted options was “really early in the morning” and all was resolved.  He attributed the mix up to the fact that Delta and Northwest’s reservations systems aren’t completely in synch yet. Moral of the story: Be on the safe side and bring any official documentation of your flights with you to the airport.Â