In Illinois, United States
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Easy terrain, accessible to anyone inside the passenger security area, i.e. you must be departing, arriving, or in-transit between flights or otherwise have legal access to the TSA security area.
Have some time to spare? Not leaving for a while? Check out this location and keep yourself busy geocaching while you wait.
Find this location and figure out the letter and number associated with it. Confirm your find by entering the location in this Google form.
Don't post the answer as part of your find, even if encrypted.
Since you will be inside it won't be easy getting a good signal, but stay near the window and you should be fine.
Vg'f abg gur qvabfnhe be nalguvat gb qb jvgu vg. ;)
Last Updated: on 9/19/2017 5:38:55 PM Pacific Daylight Time (12:38 AM GMT)
Coordinates are in the WGS84 datum