So, the Calendar. Doesn't feature particularly prominently, always blurry, but it peaked my interest. Not enough resolution on the DVD to do anything but make me think "Grand Canyon".
then I found this picture today:
View attachment 1041944
best image I'd seen of the Calendar
blown up:
View attachment 1041946
Still says Grand Canyon to me
Also that clearly says TWA, and the layout of the dates can only be November 1940
So I looked up Grand Canyon on the New York Public Library website and found this image:
View attachment 1041945
This is Bissell's Point near the Hotel El Tovar. I'd suspected Bissel's point, from other images before I found this, but the shadows match here, acting as confirmation.
here it is on Google maps:
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With November 1940 and TWA I was able to track down a picture of this calendar:
View attachment 1041947
clearly the correct date panel.
That's what I have so far. I haven't been able to locate a copy of the actual picture, or a matching TWA calendar. It's possible they put another picture over an airplane photo, as it's not the only landcape picture in the office. But I do have enough info to replicate it if I really wanted to.