When you pass all your tests and join the Infinite Flight ATC team the rank you acquire is ATC Apprentice. It’s the rank that proceeds the first rank of ATC Observer.
The ATC Apprentice rank only allows you to control class Charlie and Delta airports on Tower, Ground or ATIS, only.
Each week they release an ATC Schedule. The schedule as featured regions and airports for each day. You may notice that usually there aren’t a ton of class Charlie or Delta airports on the list of featured airports. So what airports can an Apprentice open?
They can open within the region, usually staying at least 35nm clear of any other featured airports. A great resource to find airports that many use is the airport search on ifatc.org.
Chris McKulka’s, creator and owner of ifatc.org, main motivation for creating the site in the first place was to aid new controllers in finding airports. It then blossomed into what it is today, a hub for all controllers featuring terrain maps for select airports, the airport search I mentioned, the ATC schedule, inbound traffic statistics, active frequency tracker, and much more.