if anything,delta should either stay in PDX or transfer the flights to DFW
seriously because I don't think cincinatti or salt lake city are big enough markets for international traffic,If I were delta I would make CVG a domestic hub and make SLC sort of a DFW,the market is big there,and there is a big population,I personally think PDX is a good place to have your asian flights. There is a market promised there and I think Delta should give PDX another chance.
I think AA might move in if Delta really decreases PDX service,AA would be good because they have a lot of focus cities and mini hubs on the west coast but the western most hub is DFW and that is about a three hour flight away from the west coast and AA could also compete with United out of PDX too.
Give me a break, I created this username when I was a kid...