Originally Posted by
Uplinker
This is (or was) a professional pilot's forum, so three letter codes of major airports would be known or easily looked up by professional pilots. Haven't we all got an old copy of the Aerad books, with all the 3 and 4 letter airport codes in the back, or is that just me.
Or, if all else fails, ask the guys who assign them:
IATA: Airline and Airport Code Search