"G. Burkhart" wrote:

I may be wrong, but don't most 3-letter identifiers offer weather reporting
of some type? There are probably exceptions, but if the identifier contains
numbers, they don't offer weather reporting. I have seen identifiers change
from having numbers to all letters when they got AWOS.

That's usually true. An exception is G. O. Carlson-Chester County Airport,
Pennsylvania. It's had weather reporting for a while now and I've heard of no
plans to change its identifer from 40N.


I suppose if they
lose their weather reporting, they could revert to an identifier with
numbers.

I remember reading online about airport identifiers a while back. Now, if
only I can find it again...

I don't think DRU ever had wx reporting but could be wrong. My guess is that FAA
wants to reserve DRU/ KDRU for someplace else, it's just unusual to see an
airport lose a three letter. Those three letter ID's are probably getting
pretty scarce, especially with all of the weather machines deployed everywhere.