Never saw anything less than 1800 on CO. On the other hand, NW and DL have F and A fares that are about 1200 r/t all-in from some eastern cities, and for anyone wanting the Plat challenge on AA, they offer them too. NW is a good deal if you can catch the MSP-HNL DC10 for the WBC seats, else it is regular FC blue fabric seats with domestic service. DL is not worth it at all. I wouldn't pay more than 1,000 if that, for their cramped 764 quasi-coach FC seats.