The following article or section concerns information that is considered even less canonical than the chance of a happy ending. Any information following should not be used as a source for the canon of the book series.
Hovercraft Maintenance is a book which exists in the continuity of the 2004 film adaptation of A Series of Unfortunate Events.
The book was included in the Baudelaire Library, and read by Klaus Baudelaire. It likely burned in the Baudelaire Fire.