NTSB blames 'deep' systemic failures for deadly midair collision near Washington D.C.

After a yearlong investigation, the National Transportation Safety Board blamed multiple systemwide failures for the midair collision of an Army Black Hawk helicopter and American Airlines regional jet that killed 67 people.

"Deep, underlying systemic failures — system flaws — aligned to create the conditions that led to the devastating tragedy," said NTSB chair Jennifer Homendy in her opening remarks.