Magical Express question...

in the past when i have gone to disney, i've gone with my family and the last two times there were a lot of us, so we've always rented a car. however, for my upcoming trip im just going with my bf, so we're not going to rent a car- hence i wanted to try this magical express that i've heard about... ...basically my question is...if anyone knows lol...do i have to book my flight through the disney website in order to take advantage of it?:confused: if anyone has any idea that would be great =)

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