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.

American Airlines CEO Robert Isom shared a letter to all employees sharing updates and resources following the deadly mid-air collision.

An FAA statement said a PSA Airlines regional jet collided midair with a Sikorsky helicopter. Here’s what to know about the airline.

The American Airlines’ subsidiary has ties that go back decades in Ohio, and just said it was moving its headquarters to Charlotte.

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.

D.C. police confirmed a crash had taken place over the Potomac and that search and rescue operations were taking place in the river. Donald Trump later weighed in.

American Airlines Group Inc. (NASDAQ: AAL) owns PSA, which already has a large presence in Charlotte, operating regional flights on American’s behalf. American is based in Fort Worth, Texas, but runs its second-largest hub at Charlotte Douglas, known as CLT.

“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.

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.

Late Wednesday evening, an American Airlines regional jet operated by PSA Airlines collided with a U.S Army helicopter and both crashed into the Potomac

The PSA Airlines Bombardier CRJ-700 collided in midair as it approached the D.C. airport around 9 p.m. local time, according to the Federal

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.