With current tagging scheme for airports there is no reliable method to decide whatever something is a major airport (serving a big city) or a small unimportant barely used one (grassy field with a shed).
It would be highly useful to start using tagging method that would allow it. Considered methods: - check area of tagged element - but most aeroway=aerodrome are tagged as nodes - check for presence of icao or iata tag - but some really small airports have this codes - whether the name or name:en tags contain clue words such as "international" or "heliport" - but it is an ugly hack and heuristic, not a reliable solution - check aerodrome key - but it is not widely used ( http://taginfo.openstreetmap.org/keys/aerodrome ) - a new tag like [regular_commercial_traffic=yes] (but it would be necessary to start using it) None of this method really works - and I would ask people tagging airports to consider - tagging aeroway=aerodrome elements as areas, not as nodes - using aerodrome key (also - verify whatever it is a good and usable idea) - introducing new key that would allow to decide whatever airport is important or not See https://github.com/gravitystorm/openstreetmap-carto/issues/1143 for details. See http://www.openstreetmap.org/#map=10/39.6554/-86.3896 for area where it is a major problem.
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