The airport code for Bathurst Island Airport is BRT.
The airport code for Bathurst Airport - New Brunswick - is ZBF.
The airport code for Hamilton Airport - Australia - is HLT.
The airport code for Bendigo Airport - Australia - is BXG.
The airport code for Albany Airport - Australia - is ALH.
The airport in Perth is very origionally named and is called "Perth Airport"
The airport code for Zagreb Airport is ZAG.
The airport code for Jammu Airport is IXJ.
The airport code for Shannon Airport is SNN.
The airport code for Miyako Airport is MMY.
According to a search of the internet, there is a small airport with the code IDK in Indulkana, Australia.
Honolulu, HI - Honolulu Airport (HNL).