This is an interesting site. This web site refers to all UK military aircraft which have carried the suffix 666. Sons of Damien
He ends up with a totally random listing of aircraft, and titling his website after this aspect of his research makes it seem weird. Which is a shame, because some of the other stuff is much more interesting - the history and current status of the aircraft used in the BofB film, for instance.
Some great stories and information but I wonder whether he will undertake new research now that scholars believe that 666 is an error, and should be 616?