I'm trying to identify the aircraft in this photo of my great grandfather. The photo would have been taken during the mid to late 1920s, possibly early 1930s. He lived in Utah (not sure this helps?). It's hard to tell much from the cropped photo, but it's all I've got. It looks to have a distinct wind screen shape. Looks to be a biplane. Not sure what the logo/writing is on the fuselage. Any info or even guesses are greatly appreciated!
Your picture looks like this Stearman C3MB:
Here is another Stearman C3MB, National Parks Airways Inc had several of this aircraft: