Carriers include Horizon Airlines , Skywest Airlines ( flying as both United Express and Delta Connection ) and Allegiant Airlines provide direct service to Portland , Seattle , Salt Lake City , San Francisco , Las Vegas and Mesa , Arizona .
Carriers include Horizon Airlines , Skywest Airlines ( flying as both United Express and Delta Connection ) and Allegiant Airlines . 
 These carriers provide direct service to Portland , Seattle , Denver , Salt Lake City , San Francisco , Las Vegas and Mesa , Arizona .