No doubt PHX has been good for US, but I wonder what would happen to it when placed between a DFW fortress hub and the LAX focus. I personally don't think there is enough room for all three to survive long term. A combined US/AA will still have a large presence in PHX years to come, but it will dwindle. 5yrs after the merger i think it would be on the same level as CVG/MEM are for DAL