Browsing airports in WI, selecting Green Bay leads to W26 and an error. I think it should be KGRB which works fine if you enter it manually.
The Wikipedia entry for Falcon field in Georgia points to an entry for Falcon field in AZ.
Thanks for pointing this out - I’ve corrected the data. I used to fly into FFC once upon a time, so I’ve got a bit of a personal connection here. 