The Hang Glider is a device used by Snowball and Firey.
It first appeared in Take the Plunge: Part 1, when Snowball was using it, and accidentally saved Rocky from a mountain.
In the appropriately named episode Return of the Hang Glider, Firey used it to save Leafy from being crushed by the Announcer Crusher.
It also makes a cameo appearance in No More Snow! when Ruby and Book being chased by Evil Leafy in the Evil Forest.
Snowball using the Hang Glider.
A silhouette of Firey and Leafy going off into the distance
the hang glider in the evil forest