Hi,

until recently, I used Plan-G, now I'm in the transition to Little Navmap and look for a function to highlight or filter my preferred airports.
What I mean: In Plan-G, it's possible to create a list (.txt file) with ICAO IDs that will be marked (means: highlighted) on the map with another color as the other airports.

I read the topics "Add Custom Airport?" and "Show only addons (airport)" and excluded fsAerodata, ORBX Vector and ORBX Germany North/South (otherwise every german airport is marked as "add-on"), but still see many "add-on airports" around the world that I didn't buy and would never fly to, maybe they come from some ORBX regions or whatever.

Excluding the complete ORBX stuff isn't appropriate, as ORBX stores its airport BGLs (e.g. ORBX LOWI) below their top level directory.

So can I mark or filter or highlight my preferred airports in Little Navmap ?
Maybe I've overseen something in the manual ?

Nice idea for the airport highlighting. Noted.

Maybe you already did this but did you try to exclude the unwanted add-on airports from add-on recognition in the options dialog: https://www.littlenavmap.org/manuals/littlenavmap/release/2.4/en/OPTIONS.html#select-paths-to-exclude-add-on-recognition
Do not exclude them from loading altogether. You can add folders and files to this list. Probably a bit too much to add airports around the world.

Another better option (if your preferred airports are not too many) is to create a userpoint for each one. Simply right click on an airport and select "add userpoint".

Alex