Dear John, Greeting from The Bronx.  As to the availability of
"Flitterin'", Aeolian 1553, I do not presently have it, but when
the Disney movie first came out Aeolian offered a boxed set of piano
rolls featuring all the tunes from that movie ("Summer Magic").

There even was an LP record with all the tunes played on a player
piano:  Flitterin'; The Ugly Bug Ball; Femininity; Summer Magic; etc.
(I'd seen it offered second hand at Colony Records in Manhattan too
many years ago.)

Don't know if this helps, but good luck on your search.

Sincerely,
Dale F. Rowe
Bronx, New York