I've printed out (from this web site) frequencies used by O'Hare airport and when doing a general scan of the aero band came across a few frequencies not listed on this site (or maybe I missed them??). So, I'm wondering if someone out there could please help me figure out who's using these frequencies: 134.875, 134.775, 126.875, 133.2375, 132.200, 123.00, 135.200 (this one's possibly approach??), and 133.875.