Dr Hunt is shown removing an airline luggage tag from his bag after returning from Germany. The tag indicates that he traveled from Seattle to "TXL", which is Berlin's Tegel Aiport, on flight BA 4901. Arriving in Berlin could be considered unusual, as most of the US Army's facilities in Germany are much more easily reached from the far-larger airport at Frankfurt-am-Main, but the flight number is definitively incorrect as it's a service operated by American Airlines between Birmingham, Alabama, and Dallas-Forth Worth, Texas.