Originally Posted by
Madisonman39
As for entry exit, the answer is only partially correct. When you are coming from the security area, you enter on one side and depart from the other. When you are coming back from an international flight to customs, you exit the SAME side that you came in.
That's not always true. Sometimes IAD uses the single-entry/exit mobile lounges, normally used to transport pax to the international arrivals building, on the C/D to A or C/D to baggage claim routes. That happened to me on Monday. The way to tell the difference between the mobile lounges is that only the single-entry/exit lounges have seating in the center of the lounge. The dual-entry/exit lounges only have seating along the windows.