Wondrous item, rare
This saddle is made from red leather stamped with a feather pattern. When fitted to a mount, you can use an action to speak its command word. This causes a pair of bird wings to sprout from the mount’s back for 1 hour or until you repeat the command word as an action. The wings give the mount a flying speed of 60 feet. Once used, this property of the saddle can’t be used again until the next dawn.
-Mordenkainens Tome of Marvelous Magic I