No. 3 being no. 4...?
This movie was made in 2000 and is considered no. 3 in the row of An American Tail-movies, but there's also the movie "An American Tail: The Mystery of the Night Monster" from 1999 - http://www.imdb.com /title/tt0197230/ - which is written and directed by the same people as this movie, thus making this one the 4th.
Howcome this one is considered the 3rd movie?