I live in Alaska, where we use a different airport prefix than the rest of the country (except Hawaii). For example, FAI becomes PAFA in the ICAO world. This causes a problem with tracking flights in FlightAware because many many flights are listed as originating or terminating in KFAI, which is an invalid airport code. So when searching for flights to PAFA, not all will show up because of the KFAI issue.
My suggestion is to allow searches for KFAI (or whatever the airport would be in Alaska/Hawaii) so that it is possible to see all the flights into the airport, including the mislabled ones.