The Jan. 29 collision over the Potomac River in Washington, DC — which preliminary reports have blamed on the military Black Hawk flying too high — was the deadliest US air disaster since 2001, and caused officials to change the flight path of helicopters near the airport.

An Army Black Hawk helicopter reportedly nearly crashed into two separate airliners at Ronald Reagan Washington National Airport.

An Army Black Hawk helicopter caused two near-misses with commercial planes at Ronald Reagan Washington National Airport on May 1. Air traffic controllers told the Delta and Republic flights to perform 'go-arounds' because of the 'priority air transport helicopter.