Hmmm...something is amiss. I ran the Navdata Reader Tool and updated FS ATC Chatter according to the instructions, but I actually lost quite a few facilities for some reason. Below is the log file:
2021-06-03 09:19:59.057 -07:00 [INF] FS ATC Chatter version 1.0.0 starting up
2021-06-03 09:19:59.773 -07:00 [INF] Fetching latest version information
2021-06-03 09:20:01.249 -07:00 [INF] Latest version is 1.0.0 Final (build 17), executing version is 1.0.0 (build 17)
2021-06-03 09:20:01.257 -07:00 [INF] Loading facilities from C:\Program Files\Lockheed Martin\Prepar3D v5\FS-ATC-Chatter\navdata-default.sqlite
2021-06-03 09:20:01.508 -07:00 [INF] 34396 facilities found
2021-06-03 09:20:01.658 -07:00 [INF] Found 14455 clips total
2021-06-03 09:20:01.695 -07:00 [INF] Selected controller type is 'None', clearing clip list
2021-06-03 09:20:01.726 -07:00 [INF] Connected to simulator: Lockheed Martin® Prepar3D® v5 (5.1.12.26829)
2021-06-03 09:20:01.727 -07:00 [INF] Loading facilities from C:\Program Files\Lockheed Martin\Prepar3D v5\FS-ATC-Chatter\navdata-Prepar3dV5.sqlite
2021-06-03 09:20:01.795 -07:00 [INF] Setting origin point
2021-06-03 09:20:01.884 -07:00 [INF] 33213 facilities found
2021-06-03 09:21:02.190 -07:00 [INF] Pausing chatter due to simulator pausing
2021-06-03 09:22:42.435 -07:00 [INF] Setting origin point
2021-06-03 09:22:43.060 -07:00 [INF] Clip list rebuilt with 2668 clips for controller type "Center" in region(s): "UnitedStates"
2021-06-03 09:23:13.799 -07:00 [INF] Selected controller type is 'None', clearing clip list
From the above, it looks like there is actually less facilities found by about 1K