Must Be Able to Fly

The North Pole is gearing up for the holiday season, but this year brings an unexpected turn: the reindeer are sick and a replacement must be found before Christmas Eve! Flying creatures from mythology and folklore from all around the world arrive to try out, but Santa's head elves soon learn that it is going to take more than just being "able to fly" to navigate the sleigh as some auditions go horribly wrong!
Which creature or creatures might succeed? What traits are a perfect fit for this ...