It has only been a month since Southwest Airlines' first planes touched down in Sonoma County, but an airline turf battle is brewing in California's wine country.Now, the region is getting three new routes from Alaska Airlines, its longest-serving carrier.Alaska on Thursday announced it'll launch service this fall from Sonoma to three western cities: Phoenix, Salt Lake City and Boise, Idaho.Each of the new routes will begin on Nov. 1The move com…