|Stinson Junior SM-8A|
This aircraft apparently belongs Yellowbird Aviation. They offer rides in a couple of vintage aircraft. They're based in Deer Park, Arizona, a northern suburb of Phoenix. I used to work at the Intel facility there.
The Stinson Junior dates to the late 1920's. This one carries four people.
I don't know anything about Portland Airways (the name painted on the side of the airplane), but there used to be an airport on Swan Island in Portland. It's all industry and railroads now.
That protrusion on the leading edge of the right wing might be a landing light, which makes me wonder when landing lights were introduced, but I'm not going down that rathole right now.