SkyWest Airlines (OO, St. George Municipal) has started operating for US Airways (Phoenix Sky Harbor) from the latter's Phoenix Sky Harbor homebase as US Airways Express. It currently operates five CRJ200 on behalf of the carrier having replaced the same number of aircraft previously operated on behalf of US Airways by Mesa Airlines (YV, Phoenix Sky Harbor). Mesa continues to operate DHC-8-200s and CRJ900s as US Airways Express.