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Airport information question

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I have found a site, that contains a lot of airport information (AIRNAV.COM). I did a search for KSFO (San Fran.) and found a lot of info. One section I don't understand is:IC: 134.5 135.1 351.8 PTC: 118.2 Does any one know what the "IC" section is for. I notice one military freq. of 351.8. Perhaps a freq. that the military would use for their approach? Any ideas?Thanks, jim b

Great site, put in favorites, no idea ;)

I believe PTC stands for Pre-Taxi Clearance and notice that the frequency listed (118.2) is the same as the clearance delivery frequency.As for IC, I have no idea what it stands for, but 135.4 is a Bay Approach frequency.John

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