United Express is a regional airline that operates as a subsidiary of United Airlines. It provides essential air service to smaller cities and regions, connecting them to larger hubs. The airline primarily uses smaller aircraft, allowing it to serve routes that may not be profitable for larger planes. Founded in 1985, United Express operates under a code-sharing agreement with United Airlines, meaning that flights are marketed under the United brand. The airline is known for its reliability and customer service, making it a popular choice for travelers in underserved areas.