come up with a better solution for display airport codes for non-US airports

[jeremybmerrill]

right now, it only displays US airports (and the Canadian airports that fly to LGA)

perhaps via translating ICAO airport codes to IATA, we can get a three-letter code that's comprehensible in the general case?

[jeremybmerrill]

the ICAO to IATA airport code database https://github.com/jpatokal/openflights / http://openflights.org/data.html#airport might be a good place to start

rather than displaying the ICAO airplane code from the routes file, we could instead find its IATA equivalent, which tends to be (is always?) 3 characters and probably more recognizable (e.g. LHR is obviously Heathrow but who knew EGLL was too??)