NON-FOYER SHREDDED WHEAT ADVERTISING POSTCARDS: FLYING CIRCUS CARD

The card below is a curious card, and I do not know whether it was issued by Nabisco, or by American Airlines.  It was found amongst some airline collectibles, but that really doesn’t answer the question.  It replicates one of the box insert cards, which were included in Shredded Wheat boxes in 1948.

I would be interested to learn anything more about this card – why it was issued, and where it was available.  If you know any more than I do, please contact me at jwalton971@aol.com