Tara Chace Mar 23, 2015:

interim controlled entrance/exit space Families don't have to wait in the cordoned-off line. They can enter that glass door over on the right and once they go through that first door, they will be in an enclosed space. The door will be closed and they will be checked out for entry. Once they pass they will be allowed through a second door that releases them into a public (security screened) space. Embassies have this, too. So it's like an interim zone. We use the term "sluice" for this in some contexts (like in ship locks--again where you are enclosed in an interim space before being released again into the common space). No idea what we call it in English in an airport security context, though.