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https://www.usatoday.com/gcdn/authoring/authoring-images/2025/01/31/USAT/78098642007-20250131-t-143339-z-910066719-rc-20-lca-7-ahzu-rtrmadp-3-usacrashwashingtondc.JPG?crop=3999,2251,x0,y208&width=1600&height=800&format=pjpg&auto=webpThe NTSB says when the Jan. 29 collision between a passenger plane and helicopter occurred, the air traffic control tower had five persons on duty.