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No Clue, They just mad eup their own probably...
But I have noticed on the Cruise America Logo on the rentable RVs they use something like it (with the stars)
The rides are GREAT, the shows are GREAT, the fun is GREAT, at Marriott's Great America! REMEMBER Marriott's GREAT AMERICA, REMEMBER Marriott's GREAT AMERICA!
I know there is a font you can download, because whoever made this site uses it all over the site. Might not be the exact same as the GA logo, but it's close enough.
The font appears to be a classic font named City. I guess that Marriott had a custom version of it made up with the stars included on certain capital letters. A very similar font today is called Square Slab Serif. Of course, only the Marriott version had the stars.