The Banana Boyz dig into the Lilienthal Brothers, Otto and Gustav, who technically flew before (or maybe at the same time) as the Wright Brothers.
Otto Lilienthal on Wikipedia
Gustav Lilienthal on Wikipedia
"Forefathers of Flight" from the National Air and Space Museum
Images of Otto Lilienthal's Glider from the National Air and Space Museum
"FIRST IN FLIGHT" - Filmhaus Berlin YouTube Channel
"Otto Lilienthal - The Glider" YouTube Video
(this is the video we mostly reference)