Since wn and nw gutted mke that city and airport execs has been screaming and begging airlines to add flights. Whether it's needed or not is another story. Of course they just want tenants. Alas that's also Midwest but as for any coast. I think every airport that needs a hub has one. Only way to have a new hub is to take over another airline. Doesn't seem like dl is having huge success creating a new hub in sea for example
I think DL is doing OK; they're not pushing AS out, but they are glomming onto WN/UA share.