A source tells NBC News that, according to a preliminary FAA report, a single air traffic controller was handling both planes and helicopters when the crash occurred. Normally at the D.C. tower at that time of day and for the volume of air traffic, one controller would be assigned to planes and another to helicopters. But the use of one controller was still considered acceptable under FAA standards. NBC News’ Tom Costello reports on what might have gone wrong.

Related posts:

Seattle mayor announces plan to dismantle ‘CHOP’ zone following shootings Witness contacts police after woman swims into Biscayne Bay and disappears FBI Releases Photos Of Pompano Beach Bank Robbery Suspect Police: Girlfriend allegedly stabs boyfriend to death, currently facing no charges Fed Chairman Warns Of Higher Interest Rates As Inflation Woes Continue