Fluttershy has never been a strong flyer. She's afraid to dive. She's always the slowest. But when she confides in Soarin' that she never actually passed the flight tests for her medic's certification, her Wonderbolt is determined to fix that.
(Here you go. Sorry it wasn't up to my usual standards, Mr. Maximus. Maybe next time. Shortest story I've ever written ever award goes to.........)