Join Date: May 1998
Location: Reno, NV (RNO)
Programs: AA LT Platinum, AS, UA Premier Silver, DL, HHonors Gold, Marriott LT Titanium, Hyatt, IHG Platinum
Posts: 4,723
As a Gold on CO for the past 3 years, I would recommend CO. Upgrades are free on CO provided the seats are available. My success upgrading as a Gold has been 90%+. CO service has been excellent; the best by far of any the airlines I am familiar with. (I am UA 1K, AA Gold, US Preferred) I believe you will have an easy time getting comped to Gold on CO and a slim chance of getting comped on DL.