"Bob Crawford" wrote in message
ups.com...

Along with the dirth of ids there are also apparently restrictions
such as "the first and second letters or second and third letters of
an identifier may not be duplicated with less than 200 nautical miles
separation."


A restriction that is often overlooked. About sixty miles southeast of AUW
you'll find ATW, continue for another 40 miles or so and you'll find MTW.