"Jeff Saylor" wrote in message
...

40N in Pennsylvania has had an ILS and weather reporting for
many years. I've never heard any plans to give it a three letter;
it certainly deserves one based on the FAA's criteria. Anybody
know why this airport doesn't receive a new identifier?


One does not have to look hard to find deviations from the identifier
criteria. For example, the first and second letters or second and third
letters or third and first letters of a three-letter identifier are not
supposed to be duplicated with less than 200 nautical miles separation. ATW
is Outagamie County Airport in Appleton, WI. MTW is Manitowoc County
Airport, 37 miles ESE of ATW. AUW is Wausau Downtown Airport, 62 miles
northwest of ATW.