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Prototype Travel Air 5000, originally operated by Pacific Air Transport and registered C2615; photo taken following its use by Ernie Smith for his trans-Pacific flight as the "City of Oakland." Seen here while flying with Bay Cities Air Service following the airframe's return from Hawaii.

I can't I.D. the unmarked white high wing monoplane...is it a Ryan?

A30yoyo Looks similar, but I have never seen a Ryan with a Vert Stabilizer like that...

It's been identified on the Wings of Peace Yahoo group as the Travelair 5000 City of Oakland which made the crossing to Hawaii just before the official Dole race crash landing in a tree.
www.flickr.com/search/?w=49487266@N07&q=city%20oaklan...
....and after its rebuild?

SDASM Archives This is indeed a photo of "City of Oakland." Note the same balanced rudder on "City of Oakland" as it is filmed taking off in the newsreel below at the 5-min 30-sec mark: www.youtube.com/watch?v=4B9T9MCq_h8 Also, here's another photo of the aircraft in the photostream:

Pilot Ernie Smith aboard the prototype Travel Air 5000 later named "City of Oakland."

The prototype Travel Air 5000 "City of Oakland" came to rest on the island of Molokai after running out of gas. The aircraft was a write-off, but Smith and Bronte walked away from the crash-landing to become the first civilians to successfully fly the Pacific from the mainland to Hawaii. This image is "flopped" - reversed from the negative - as evidenced by the propeller pitched the wrong direction.