The Fly Card was the very first card Sakura captured, after releasing all of the cards from the Clow Book. It takes on the form of a large bird, which can create gusts of wind with it's giant wings. In Episode 1, Sakura used theWindy Card to stop it, thus letting her capture it.
When summoned, it causes a pair of wings to appear on her staff, allowing her to ride it through the sky. Sakura finds that this will be one of her more used cards as she goes. In the Sakura Card series, the wings appear on her back.
