ユナイテッド・エクスプレス
Three regional airlines, Envoy Air, PSA Airlines, and Piedmont Airlines, are wholly owned subsidiaries of American, but whose aircraft are in American Eagle livery. Republic Airways is independent and operates United Express and Delta Connection. SkyWest Airlines operates as American Eagle, as well as Alaska Airlines, Delta Connection and United Express. Mesa Airlines, operates in American Eagle livery and as United Express.