Doubleflight

Doubleflight (ダブルフライト) is a technique introduced in Kingdom Hearts Birth by Sleep. It allows the user to leap higher by means of a second jump.

Mechanics
In Kingdom Hearts Birth by Sleep, Doubleflight is a exclusive to Aqua that is activated by pressing,  in the Japanese versions, while in mid-jump. It has a maximum level of 1.

In Kingdom Hearts 3D: Dream Drop Distance, Doubleflight is a exclusive to Riku that is activated by pressing  while in mid-jump. In Kingdom Hearts Dream Drop Distance HD, Doubleflight requires pressing, in the Japanese version.

In Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-, Doubleflight is activated by pressing, in the Japanese versions, while in mid-jump.

Kingdom Hearts Birth by Sleep

 * Aqua obtains Doubleflight after encountering Captain Hook in the Gully.

Kingdom Hearts 3D: Dream Drop Distance

 * Riku can obtain Doubleflight from a chest at the Delusive Beginning.

Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-

 * Aqua obtains Doubleflight after finding the gear on a rooftop in Castle Town.

Kingdom Hearts III

 * Sora obtains Doubleflight after defeating the 3 Frost Serpents in Arendelle.
 * Element Form has Doubleflight as a form ability.
 * Riku has Doubleflight as a default ability.
 * Aqua has Doubleflight as a default ability.