US Transportation Secretary Sean Duffy said there was a "consolidation of air traffic controllers an hour before it was supposed to happen".

The Black Hawk helicopter that crashed into an American Airlines plane was alerted to the plane’s presence by air control twice, the first time at least two minutes before the deadly crash, according to a Washington Post report.

The Black Hawk helicopter that crashed into an American Airlines flight was alerted to the plane's presence by air control twice, according to the reports.