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.

Growth
It should be noted that only Glide LV3 and Glide MAX can allow Sora to permanently stay aloft on a flat surface; while he is using Glide LV1 and LV2, he cannot do so and will eventually stand back on his two feet within a short time.

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. In Neverland, Tinker Bell sprinkles dust to Roxas so he can fly and finally gains the Glide panel. This ability is physically alike shared ability Superglide from Kingdom Hearts.

There's also an ability accessible by Panels called "Levitate." It is gained through Panel Mix for one Adamantite, two Aerial Art++s, and 8800 Munny. This ability is alike the shared ability Glide from Kingdom Hearts. It is to be linked to High Jump.