I am proud to say that my father was at the controls when this photo was taken. His logbook shows that he flew this aircraft numerous times between 1947 and 1956, but he’s pretty sure it was 1949. SeaTac opened in 1947, but United didn’t shift its operations there until a few years later. Dad didn’t mind; Boeing Field was closer to our house.
Same aircraft (N37511) on the United ramp at Chicago.