airport codes

Recently I came across this interesting article that explains the origin of some of the more confusing three-letter airport codes.

Some tidbits:

Some special interest groups successfully lobbied the government to obtain their own special letters. The Navy saved all the new 'N' codes. The Federal Communications Committee set aside the 'W' and 'K' codes for radio stations east and west of the Mississippi respectively. The lack of these letters puts a crimp in the logic of some codes: if the city starts with a 'N', 'W', or 'K', it's time to get creative! Norfolk, Virginia, ignored the 'N' to get ORF; Newark, New Jersey, is EWR, Newport News, Virginia, chose to use the name of the airport to get PHF -Patrick Henry Field.

Lacking both 'W' and 'N' Washington National has a code of DCA for District of Columbia Airport. The newer Dulles airport just outside D.C. was DIA (from Dulles International Airport); however, the DIA and DCA were easy to confuse, especially when hastily written in chalk on a baggage cart, scribbled on a tag or a handwritten air traffic control strip, so we are stuck with the backwards IAD.

Oh, still wondering about the world's busiest airport, O'Hare International, and its ORD code? Well once upon a time, before the editor and publisher of the Chicago Tribune, Colonel Robert McCormick suggested a name change as tribute to pilot Lt. Cmdr. Edward "Butch" O'Hare, USN, there was an airstrip well to the northwest of Chicago with a quaint, peaceful name -- Orchard Field.