The fact is that I was a bit disingenuous when I said "wild guess"
I knew for certain that it was a Fred Harvey Restaurant because we would always patronize them on our way up the Northwest Tollway en route to the Dells--- My parents had close friends who owned a resort up there, and we made the trek several times a year for many years. We did this starting in the mid 60's--- The posted photo depicts the restaurant from the 50's, but believe me, the decor was the same 10 years later.
The large windows were the "giveaway" for me--- I didn't have to look up the source code of the photo to know the answer.
"Goldie, how many times have I told you guys that I don't want no horsin' around on the airplane?"