An American Airlines flight operated by PSA Airlines was involved in a midair collision with a military helicopter on Wednesday night near Washington, D.C.

US airlines had gone 16 years without a fatal crash until Wednesday night. But as impressive as that safety record had been, there have been warning signs in recent years of a significant risk of a collision like the one that just killed 67 people.

The CEO of American Airlines is seeking answers about the mid-air collision of a military helicopter and one of its regional passenger planes while it was trying to land at Ronald Reagan National Airport near Washington, D.C.

PSA Airlines, a regional airline and subsidiary of American Airlines Group, announced today that it will relocate its corporate headquarters from Dayton, Ohio, to Charlotte, North Carolina, by026.

“A PSA Airlines Bombardier CRJ700 regional jet collided in midair with a Sikorsky H-60 helicopter while on approach to Runway 33 at Reagan Washington National Airport around 9 p.m. local time,” the Federal Aviation Administration (FAA) said in a statement.

An American Airlines regional jet carrying 64 passengers and crew and a military helicopter collided in midair Wednesday night near a Washington, D.C., area airport.The Federal Aviation Administration said the crash involved a Bombardier CRJ700 regional jet operated by American’s regional carrier PSA and a Sikorsky H-60 helicopter.

Airlines have issued travel waivers to help passengers whose flights into and out of Washington, D.C., were affected following a deadly midair collision on Wednesday.

PSA Airlines is moving its corporate headquarters from the Midwest to Charlotte, the company announced Wednesday.

The number of people onboard and any fatalities is unknown at this time. The plane can carry up to 65 passengers and four crew members.

Wednesday night’s crash of an American Airlines commuter plane in Washington is one of the worst disasters for the Fort Worth-based airline in more than two decades.

An American Airlines plane carrying 60 passengers and four crew members collided with an Army Black Hawk helicopter outside Reagan National Airport near Washington, D.C. Wednesday evening. Three soldiers were onboard the helicopter and a massive search and rescue operation is now unfolding in the Potomac River.