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Looking at the link from the American Airlines web site, it takes you to a Marriott page that has, as the starting grid, what looks like an ongoing regular-thing of transferring Marriott points to United Airlines for a 20% bonus. And one needs to read carefully to get to the next grid down the page to pick American (jumbled in with Alaska, Delta and others).
I also did look at some other Marriott options, and found the Envoy Hotel, Autograph collection, in Boston. Points are indeed 1c range in value.
So I will keep my Marriott points where they are, and have a new reason to like the black metal card
Thank you for sharing the information!