Seeing that we are mostly guessing here, I might suggest that there were two people who went along for the ride and didn’t pay...?
Might have been the son of the pilot as someone suggested, and perhaps Fuddy invited her sister?
Something so simple...and on a bad day, better to keep quiet about it. The investigators would certainly know.
http://www.freerepublic.com/focus/news/3110483/posts?q=1&;page=101
See #117 by butterdezillion
#7 #8 another couple.