Plane Panel

From the Super Mario Wiki

A Plane Panel was, as the name suggests, a panel where Mario could turn into Plane Mario during the game Paper Mario: The Thousand-Year Door. It was used when the player pressed the Y button. The player could Control the Height and Distance that Plane Mario went. The first Plane Panel is found in Rogueport Sewers, however notice that there are many more panels in the game. There is also a minigame in Rougeport where the player can see how far they can get with the Plane ability.