IATA airport codes to LOC:
$ dig +short YYC.air.jpmens.net LOC 51 6 50.037 N 114 1 11.988 W 1084.00m 1m 10000m 10m
and more fun with an associated TXT:
$ dig +short YYC.air.jpmens.net TXT "cc:CA; m:Calgary; t:large, n:Calgary International Airport"
with more at Airports of the world, and other data in DNS