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18_2A SF-SL Diablo DOCILF

GPS: 37.970064, -121.989974

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Location / Name

CALIFORNIA:  Contra Costa County

GPS: 37.970064, -121.989974 

Commonly called 2A SF-SL Diablo DOCILF, site No. 2A Department of Commerce Intermediate Landing Field, on the San Francisco-Salt Lake Airway.  (Pilots also used this field on the San Francisco-Seattle airway)

Contract Air Mail

CAM #18 San Francisco CA-Chicago IL
Route established July 1, 1927
San Francisco-Salt Lake airway
San Francisco-Reno section
Boeing Air Transport awarded CAM #18 on January 28, 1927

CAM #8 San Diego-Seattle
Route established September 15, 1926
Los Angeles-Seattle Airway
Fresno-San Francisco Section
San Francisco-Seattle Airway
San Francisco-Redding Section
Pacific Air Transport July 1, 1927

Warren E. LaFollette in charge of Diablo Field

Observations and Notes

Two airmail routes passed over this arrow. 
      Contract Air Mail route #8, Seattle WA - Los Angeles CA flown by Pacific Air Transport began it's flights on September 15, 1926.
      Contract Air Mail #18, Chicago IL - San Francisco CA, flown by Boeing Air Transport began it's flights on July 1, 1927.


Contributors Photos




Concord's Air Mail Field-February 1, 1925

Diablo Air Mail FieldDiablo Air Mail Field Wed, Feb 4, 1925 – Page 13 · Oakland Tribune (Oakland, California) · Newspapers.com 

Diablo Air Mail FieldDiablo Air Mail Field Sun, Feb 8, 1925 – Page 67 · Oakland Tribune (Oakland, California) · Newspapers.com 


Diablo Field-Concord California on Flickr

Despite most sources incorrectly giving the San Francisco Bay Area airport where Boeing operated as Mills Field (which later became SFO) or even Crissy Field, these early flights actually took place from Diablo Air Mail Field on West Street in Concord, which was dedicated on February 3, 1925 in front of a crowd of two thousand people. 
Diablo Field closed on December 15, 1927 after only a few months of Boeing service, and Boeing moved operations to the new Oakland Airport. Diablo Field remained dormant apart from nine months of operation in 1941 as Concord Airport, just before the outbreak of World War II. It is now a residential area. 

Abandoned and Little Known Airfields

An impressive collection of old photos and maps of the Diablo Air Mail Field in Concord.

Air Mail Field in Land Purchase- March 9, 1925


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State of California Site



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