DL: 19 175s. I believe we take delivery of the first one this month. First few will enter service in Sept based in Seattle. No word yet on where later deliveries will be based, but the rumor has always been SEA and LAX, so I'd assume LA will see a few at some point.
Alaska: not sure how many we have in service at this point. 10ish? Announced so far is 20 total 175s for Alaska.
If you want PNW basing, OO is a good choice right now since that is where most of the 175 growth is going. Additionally, we still have another 20 or so UA 175s coming on board as well, so there is certainly a lot of growth in store on the 175 fleet. As of right now we're slated to have 104 or so 175s when it's all said and done and we have about half that on property at this point.