The movie, Sully, is about the real life event of when Chesley "Sully" Sullenberger safely landed a commercial aircraft on the Hudson River after losing both engines from a bird strike shortly after takeoff. Throughout the movie the NTSB (the National Transportation Safety Board) had been investigating the water landing to determine if Sully had actually made a mistake by going for the Hudson when he could have—and should have—headed for a nearby airport.