Pacific Air Transport (PAT) was formed in January 1926 by Vern C. Gorst, an Oregon bus line operator.
Airmail Route CAM 8 was planned by the USPO to carry the post from Seattle, Washington to Los Angeles, California via several intermediate cities.
The service was inaugurated on 15 September 1926 after arrangements had been made for the provision of makeshift lights and beacons, and persuading the Standard Oil Company to paint the names of towns on the roofs of its buildings.
Intermediate landings were made for fuel and mail at Portland and Medford in Oregon and San Francisco, Fresno and Bakersfield in California.
On 17 December 1928, PAT merged into Boeing Air Transport, but continued to operate as a separate division, retaining its own identity.