Glide

Glide is an ability that allows Sora to almost fly and it can be used to travel faster or evade enemies. In all cases, this ability is activated by hitting +  (or  +  in the Japanese versions and Final Mixes).

Kingdom Hearts
In  Kingdom Hearts, Sora learns Glide after sealing the Keyhole in Neverland. You can upgrade this ability by defeating Chernabog in the End of the World. After you defeat Chernabog you receive a new ability called Superglide. In Kingdom Hearts, all of your party members receive this ability. These abilities require no ability points.

Kingdom Hearts Re:Chain of Memories
In Kingdom Hearts Re:Chain of Memories, Sora can obtain the ability Glide by using a Key To Rewards card on the Neverland floor. Later in the game, Sora obtains the ability's stronger form, Superglide. Similarly, he must use a Key To Rewards card on the 13th and final floor, Castle Oblivion.

Kingdom Hearts II
In Kingdom Hearts II, you can receive the Glide ability from leveling up Final Form. You can upgrade the Glide ability by further leveling up the Final Form. There is Glide LV1, Glide LV2, Glide LV3 and Glide MAX. You can only get up to LV3 while in Sora's Normal Form, while Final Form gets up to MAX. It costs three AP.

Kingdom Hearts 358/2 Days
In Kingdom Hearts 358/2 Days, Roxas and the rest of the playable characters have the ability to fly in all worlds. However, in Neverland, Roxas seems to temporarily lose his flying ability. He seeks out Tinker Bell in order to get his flying ability back.