Hi,
@Rich: +1
@Rahim: I also use the same practice as Rich.
May you clarify: NRT for Narita Airport(Japan), EWR for Newark Airport(USA), ... are not Abbreviate names in English? Are no valid names on any field? -> Guidelines: Do not add it into GMM?
I saw some older edits(2009, 2010), some done by Googlers, with IATA and/or ICAO codes named as:
Language: 'empty' or English;
Type: 'empty' or Obscure or Abbreviate;
Also, some Airport features have the IATA and ICAO codes on the description field.
I also find important, and useful, to search on GMaps and find: "NRT" or LAX airport or even on Maps Mobile: "HKG Cat:Airport"; and get the POI listing/marker.
Thanks and regards,
JPF