From the Super Mario Wiki
In this form, the Yoshi can fly around the level until he reaches the Yoshi Block or until his time as a helicopter runs out. As with other transformations, the latter will send him back to the position where touched the Morph Bubble. The Yoshi Helicopter can be controlled with the D-pad. Touching an enemy while in this form will make the Yoshi fall a short distance, unable to be controlled, which can cause the player to lose time and a life if he falls into an abyss. The form returns in Yoshi's Island DS.
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