For a substantial part of the airport's history, United Airlines was the only airline to serve Redmond. In 1947 United started Douglas DC-3s service, which flew a route > Portland - Redmond - Klamath Falls - Sacramento - San Francisco - Monterey - Santa Barbara - Los Angeles. In 1959, United updated this service with a more efficient Convair 340s, which eliminated certain stops that were not needed due to larger fuel tanks, and more efficient Turboprop turboprop's. This new route was > Seattle - Portland - Redmond - Klamath Falls - Sacramento - San Francisco and back.