The match for USMM comes from the apt.dat.gz
I have try it now and included the following line in apt.dat.gz
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1 49 0 0 USMM Nadym
With only this line, FG crashs on start (klick 'Fly!').
I have then added a fake line (for runway) in apt.dat.gz. Now i have
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1 49 0 0 USMM Nadym
100 49.99 3 0 0.00 0 0 0 4 65.82035834 72.09018573 0.00 0.00 1 0 0 0 22 65.83043466 72.10486817 0.00 0.00 1 0 0 0
and the launcher will find USMM. I can also input USMM in the routemanager and USMM is visible on the map.
This means, the data in apt.dat.gz will be taken from launcher and routemanager.
To see the 3d model of the airport, you need to update the btg and stg files.
And i'm cofused why your apt.dat are not compressed.
To edit the file, i have
1) taken a copy for backup
2) unzip the file (gzip -d apt.dat.gz)
3) edit the apt.dat file
4) zipped the file (gzip apt.dat)
and the launcher was happy.