\i've seen this movie when I was about 7-9 years old.. Just remember some bits and pieces of it.
There were two sisters, one older, one younger. They were living with their father... Something happened and they appeared in a magical world, with fairies, unicorns and a flying boat... please please help!! :)

Sounds like,.

Voyage of the Unicorn (http://www.imdb.com/title/tt0249326/) (2001)


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Yes yes yes!! Thamk you sooo much!!