Elissa has discovered an honors thesis (from Ball State University) entitled, Fly Away Home: Tracing the Flying African Folktale from Oral Literature to Verse and Prose, a chapter of which is devoted to Toni Morrison’s Song of Solomon. I’ve posted below a PDF file of that chapter (it runs 10 pages) and another PDF of the entire thesis. — Many thanks to Elissa for some great research.
Elissa also found a short piece about the same subject in The New Yorker from earlier this year. The writer is a documentary film-maker.