I wonder if they will even be a partner in 6 months. AS provides non-stop service from SEA to both of CO's domestic hubs (EWR now, IAH to start soon). I keep waiting for AS to go ANC-IAH nonstop to really go after the petroleum company's business. This would really push the range of an 800 and would probably require a 700.
On top of all that, Co joining *A really puts a wrinkle into things. They will be codesharing out of SEA to places like LAX, SFO, LAS, PHX, HNL, GEG, and PDX using *A and not AS.