St. George Regional Airport is a city-owned airport in St. George, Washington County, Utah. The airport opened on January 13, 2011, a replacement for smaller land-locked St. George Municipal Airport, atop a mesa in the city, which was declared unsuitable for expansion. It is served by SkyWest Airlines with code sharing flights operated on behalf of American Airlines, Delta Air Lines and United Airlines. SkyWest, one of the largest regional airlines in the world, is based in St. George.