You might find this code helpful as a starting point, and also this for heliports.

That code (and the equivalent for Garmin) puts “aerodromes” into one of three categories:

  • Large public airports. Somewhere you would go to catch a commercial flight.
  • Military airports.
  • Other smaller aerodromes, sometimes referred to as “general aviation” - includes sites used by gliding clubs etc.

No change there, then :slight_smile:

In practice, using taginfo and overpass to look at the usage of particular keys and combinations in certain areas will be far more useful than trying to understand the wiki.