My airlines table has lots of changes to get the right logos to show. Because the monthly updates only officially affect the aircraft table, I export my airlines table before using the update, then reinstall it after doing the update.
I used to use the SQLite Manager Firefox addon to do that, but now I use the much more user-friendly NavData.db3 Editing Tool to do it.
I've grumbled about this problem on previous update threads.
BTW I notice that the latest database update does actually include a new airlines table, with vastly more airlines and their ICAO codes in it, but unfortunately with very few IATA codes. As the airlines table's only function is to translate IATA codes into IACO codes, this isn't much help, so I've stuck with my own airlines table.
Rod