Here is a list of US World War I pilots from California assembled by Mike O'Neal.
Livingston G.Irving - Berkeley - 103rd Aero Squadron - 1 confimred victory
Kenneth Marr - Ceres - Lafayatte Escadrille, CO of 94th Aero Squadron - 1 confirmed victory
Earl Dougherty - Long Beach - Famous post-war Barnstormer -
John N.Jeffers - LA - 94th Aero Squadron (Rickenbacker's unit) - 2 Confirmed victories
Charles B.Nordhoff - LA - Lafayette Flying Corps (not to be confused with the Lafayette Escadrille)
Ralph O'Neill - SF - 147 Aero Squadron - 6 confirmed victories. (also listed from Nogales, AZ)
Many US citizens volunteered for service with the RFC/RAF. Thes following are known to have served with active duty combat squadrons with the British RFC/RAF.
Edward H. Pepper - Berkeley - 2 Squadron - KIA 23 August 1918
Howard Sylvester Fey - San Diego - 16 Squadron
J.G.Newton - LA - 21 Squadron
A.O. Bryan-Turner - Berkeley - 23 Squadron
Bogart Rogers - LA - 32 Squadron - 6 confirmed victories
Arnold B. Dunn - San Diego - 40 Squadron
Albert Alexander Allen - San Diego - 46 Squadron - KIA 11 October 1917
Merideth Brown Lewis - LA - 54 Squadron - KIA 15 July 1918
Van Dycke Fernald - SF - 57 Squadron
George T. Olmstead - SF - 64 Squadron - KIA 1 august 1918
William Edward Taylor - LA - 70 Squadron - KIA 31 May 1918
William Henry Leaf - LA - 92 Squadron - Killed in accident 30 OCt 1918
Albert B.Mason - Exeter - 101 Squadron
Tod B.Burns - LA - 201 Squadron
William V. Skall - LA - 208 Squadron
I may have more information on any or all of these men, so if you would like elaboration, please feel free to ask. I suspect there were also a number with the French, but it will take me some time to dig those out for you.
All the best from New Jersey,
North Brunswick, NJ
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Learn more about the United States Air Service's 1st Pursuit Group:
Toul, Touquin, Saints and Mauperthuis and Rembercourt, "American Eagles" - 345 page illustrated history of US Combat Aviation in World War I