Southern Transcontinental Air Mail Route

Southern Transcontinental Air Mail Route 33 (AM-33) was a major airmail route in the United States operated in the 1920s and 1930s. It connected the southeastern United States with southern California and played a significant role in the early development of coast-to-coast air transport. The route was part of the larger effort by the United States Post Office Department to establish a nationwide network of air mail services and to support the growth of commercial aviation.

History

In the aftermath of World War I, the United States government began experimenting with airmail routes to demonstrate the feasibility of air transportation. The success of the original Transcontinental Air Mail Route encouraged the creation of additional long-distance corridors, including Route 33, which provided a southern alternative to the more northerly paths.

Establishment and Early Operations

AM-33 was established in the early 1920s as part of the U.S. government’s expansion of airmail infrastructure. The route was designed to take advantage of milder weather conditions in the South, particularly in winter months, when northern routes faced more frequent delays due to snow and fog.

The initial segments of the route linked major cities in the Southwest and Southeast, offering faster mail delivery and encouraging aviation infrastructure development along the way.

Contractors and Aircraft

Under the provisions of the Contract Air Mail (CAM) system, segments of AM-33 were operated by private companies contracted by the Post Office Department. Airlines such as American Airways and Western Air Express flew parts of the route using aircraft such as the Douglas M-2 and the Ford Trimotor.

Route Description

AM-33 ran approximately from **Los Angeles, California**, to **Jacksonville, Florida**, with intermediate stops in major cities including:

- **El Paso, Texas** - **Dallas, Texas** - **Shreveport, Louisiana** - **Birmingham, Alabama** - **Atlanta, Georgia**

Exact stops varied over time as the route was refined and as additional airfields were built. Some segments overlapped with other airmail routes or served as feeder routes.

Significance

The southern transcontinental route served as a vital link for mail and later passenger transport between the West Coast and the Southeast. It contributed to the economic growth of cities along its path and played a role in shaping the early commercial airline industry. The route also demonstrated the advantages of year-round air operations through more temperate climates.

Transition to Passenger Service

By the late 1930s, many airmail routes, including AM-33, were increasingly integrated into commercial passenger airline networks. Carriers operating the route began transporting both mail and passengers, leading to the eventual phase-out of designated airmail-only services.

Legacy

While Route 33 was eventually discontinued as an airmail-only service, many of the airports and cities served by AM-33 remain central hubs in U.S. aviation. The route helped establish vital infrastructure and flight paths still in use today.

References

External links

[Smithsonian National Postal Museum – Airmail Service History](https://postalmuseum.si.edu/airmail/)
[U.S. Centennial of Airmail Flight Archive](https://airmail100.com/)

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