[Tagging] Draft proposal for Key:aerodrome

[Martin Koppenhoefer]

I believe we should tag passenger numbers a year. We would not have to tag
all airports with this, especially for small airports these might be hard
to get, and we do not necessarily need up to date numbers, just a number of
one of the past years. This will usually be available for the big airports
and the presence of the information (and a reasonable threshold) would make
it possible to show the significant airports much earlier while those with
low or no numbers could be de-emphasized. I'm sure it would give a fairly
good indication of importance.

I'm not completely opposed to different main airport types (military,
scheduled commercial passenger flights, ...), but from the mentioned there
are known problems, e.g. "international" has been subject to former
criticism, because it is not clear in meaning and not suitable for
distinction: for example an airport in Germany which has flights to
Germany, Switzerland and Austria is a whole different kind of airport than
one that offers flights to Hongkong, Houston and Harare.

Because there will often be combinations (e.g. military part of a general
aviation airport, or a part for small private planes, etc.) I agree we
should better capture the details with several tags for well defined
properties as suggested by Christoph.

Cheers,
Martin
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