Okay. Lets look into marker 10. This post caught my eye. There are six posts with [10] in them. 334, 364, 365, 453, 455, 2709. Looking into ATL and concourse F I found this.
https://www.travelandleisure.com/airlines-airports/atlanta-airport-map-terminal-guide
The new complex includes an additional entry into ATL with separate parking, check-in kiosks, security checkpoints, baggage claim area, and U.S. customs. Note: you need not have an international flight to go through the international terminal and security lines are often a lot shorter.
International carriers Air Canada, Air France, British Airways, KLM Royal Dutch Airlines, Korean Air, Lufthansa, Qatar, Turkish, and Virgin Atlantic along with Delta have check-in counters at the international terminal.
Delta recently started offering a new biometric option to international passengers flying nonstop from Atlanta on Delta and its partner airlines Aeromexico, Air France-KLM, and Virgin Atlantic. This means facial scanning machines will replace the need to show your passport at self-service kiosks, baggage counters, TSA checkpoints, and boarding gates.
Okay.. So latest Q post is congratulating anon on finding connection. The date of the post? 12/17 which is mentioned in 365 pic related. DIG ANONS. Will continue myself on decode but my keyboard is messed up and on screen keyboard takes forever to type stuff.
ATL IAD..
IAD is Dulles Airport, also known as Washington Dulles International Airport (IATA: IAD; ICAO: KIAD, FAA LID: IAD). Abbreviation used to be DIA.