First of all, I'm not an extremely frequent flier. If I stick with one airline all year, I could make the lower tier. That hasn't been the case in the past though. In fact, I have 3 flights planned on 3 different airlines coming up over the 2nd half of the year...not too good for racking up miles.

Having said that, I was wondering if CO would match AA gold. I plan to do the AA challenge using an international trip which would give me the 10K+ needed. Will CO give me silver elite status? Should I even worry about it or stick with AA in the future? They both (Delta too) have convenient low-priced routes for my most frequent travel, so I'm focusing on choosing among those.

Thanks for your suggestions!