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https://www.washingtonpost.com/wp-apps/imrs.php?src=https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/SUPMWOSFSVAJUG6JJNP6IPEOM4.jpg&w=1440The catastrophe immediately raised questions about the close proximity in which helicopters and jetliners soar over the busy skies of the nation’s capital.