I've just updated the file with all the missing airports from this thread (since I could never find the latest one).
latest dat file:
http://www.cpmaverick.com/ARPT.dat
latest install (I could find):
http://www.cpmaverick.com/flyingfish-1390-setup.exe
You'll need to install and then overwrite the ARPT file in the installation directory with the one linked above.
Please let me know if any airports are missing, or if there is a functionality problem, and I will update the file.
Happy fishing!