The Army is pausing helicopter training flights around the Pentagon after a Black Hawk on Thursday forced two commercial airplanes to abort landings at Washington’s Ronald Reagan National Airport, three Army officials confirmed Monday.

U.S. Transportation Secretary Sean Duffy says it is “unacceptable” that two commercial aircraft had to abort landings at a Washington airport this week because of an Army Black Hawk helicopter that was flying to the Pentagon.

Helicopters flying near Reagan National Airport caused flight diversions yesterday (Sunday) and Thursday. The first incident involved an Army Black Hawk helicopter taking a "scenic route around the Pentagon,