What we know about the midair collision outside D.C.

A passenger jet carrying more than 60 people collided with an Army Black Hawk helicopter carrying three soldiers near Reagan National Airport Wednesday night. Major Garrett is joined by CBS News senior transportation and national correspondent Kris Van Cleave, CBS News senior national security correspondent Charlie D’Agata, and CBS News transportation safety expert and analyst Robert Sumwalt to examine what we know about the incident.

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