<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by JonNYC:
None-- you will be much, much better off at AA (as a specifically "mostly international" traveler.) AA will be a much, much better choice for you-- unless you particularly enjoy flying in cramped coach. Do you, by some chance? 
plus a first year "bounty" of 16 o/w SWU's.
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Do the initial 16 ow SWU's have an expiration date? I have almost no AA miles right now so they would be important.
How do AA and its partners, in particular, BA and Cathay, treat carry-on baggage? CO (with the major exception of VS code shares) has always been carry-on friendly and that is important to me.
Also, how does the Exec Platinum Challenge work?
I do not want to leave CO, but these upgrade fees (and sometimes paying for it and not getting it) is just absurd.