A massive recovery is underway in Washington's Potomac river after a passenger aircraft carrying 64 people collided midair with an army Black Hawk helicopter with three soldiers on board. Authorities say there are no survivors. Aviation expert Miles O'Brien joins Christiane to discuss what happened and the rescue efforts.

Also on today's show: Gina McCarthy, Former EPA Administrator/ Fmr White National Climate Advisor; actors Jessica Hecht & Bill Irwin ("Eureka Day"); Anne Neuberger, Fmr. Deputy National Security Adviser for Cyber and Emerging Technology 

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