[denizen467]

At first I had no idea what flags you are talking about, but fortunately the sun was low when the satellite photo Google uses was taken so it was easy to find a long row of many gigantic flags (at least their shadows). It's just a couple dozen yards outbound of the main cashier booths for the main garage, right? Looking at the same area on Bing's satellite photos, the only buildings that were there looked like temporary sheds or trailers. Maybe they were temporary offices for the construction company doing the giant departure level awning project, or something? Also, from the photos you can see there is a driveway leading to an underground part of the area you identified, so who knows what all is down there anyway.

Regardless, there is lots of delicious LAND available in those surface lots, upon which new terminals or facilities will hopefully be built.