It’s always going to be too chaotic to get a unified database. Best to keep an eye on the most popular uploads sites which’ll be -
https://www.nexusmods.com/microsoftflightsimulator/mods/categories/4/?BH=1
https://msfsaddons.org/scenery
So far there’s lots of UK scenery but not a huge amount of airports. I fancy attacking a few others soon.