I know USAir was had a little part of the market when they purchased PSA, but when United started their Shuttle and Southwest increased their presence, they pretty much pushed USAir out of the westcoast market. United still has a big chunk of the LAX/SFO routes, but Southwest got smart, backed out of SFO and concentrated on OAK to provide cheaper fares to the bay area. Now most west coast flying for UAL, AA, and DAL is with the express/connection carriers. Could DAL, CAL, US, compete in the west coast market with Southwest as the dominant operator? Or would they have to still rely on their regional affiliates?