The first Horizon E175 isn't due until sometime nexy year. SkyWest is operating them for AS already, though, but I don't think there's any listing of routes by aircraft type. I can say that they're used on a lot of intra-west coast flights like PDX-BUR and SJC-SNA, as well as a lot of mid-cons out of Portland like PDX-AUS and PDX-MCI.