June is here!!! Is it Airport renderings time? lol 
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Regarding lounges, I'd be hopeful for multiple site opportunities with new construction, as they're a non-aeronautical revenue generator for airports. Plus, STL can better position itself as a layover hub rather than just end-destination traveler airport, that airline lounges can definitely increase our attractiveness for establishing more midcontinent flights. I'm not knowledgeable enough to know what to truly expect (Delta, AA, etc.), but I bet there'll be room for multiple lounges to be built. Good times.
^ Realistically the layover opportunity is Southwest Airlines. I can see some with code share/alliance and some of the international flights but that has to be very limited by just shear count
Logistically, it makes sense with international gates. It will depend, of course, on how many are added, but I could see a scenario where the sterile corridors for international traffic could be raised above the main departure level of the concourse. That extra height would allow for club suites, etc. Otherwise your squeezing them between the headhouse and the concourse.
This. How many months can I be behind on a project as impactful as this before I get canned or the budget gets pulled?