Disasters & Survival - 214 free documentaries about air crash investigations.
Start with The Miracle Landing Of Aloha Airlines Flight 243 (50 min, Wonder), then Trapped On An Airplane With A Murderer (50 min, Wonder). All 214 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on air crash investigations is Fly by Wire by William Langewiesche.