In my article "Snakes and Ladders" in the May 1998 Word Ways, I recorded just one example of a word ladder with nine-letter words. The impression may have been given that it was the only one. As recorded in "Statistics of Word Neighbors". In the November 1997 issue, about 48 per cent of nine-letter words have one or more words that will sit next to them in a ladder, so, given in excess of 100,000 nine-letter words, there will be many ladders.
"Near-Ideal Nine-Letter Word Ladders,"
Word Ways: Vol. 33
, Article 12.
Available at: https://digitalcommons.butler.edu/wordways/vol33/iss3/12