make sure you get a coupon from CO.

I got in a nice little argument with them because I was flying AC and they said being a *G didn't matter. I needed a coupon from CO. I pointed out that CO's website said that lounge was available but they said no.
I had just come from the AA club where they wouldn't let me guest my father so we tried Avianca and presented our *G cards, his President's Club card, etc but to no avail. At that point my flight to YYZ was boarding so I gave up. His JJ flight to GRU wasn't for an hour or so but he didn't feel like going to CO to get the pass.