What do you know about aircraft and helicopters near Washington

Officials said that a passenger aircraft carrying 64 people collided with military helicopters on Wednesday night. When approaching Reagan National Airport, it hit the Potoma River near Washington on Wednesday night.
PSA Airlines operates as American Eagle 5342 for its parent company, and takes off from Wichita in Kansas, with 60 passengers and four crew members. At around 9 pm, it collided with a Army helicopter with three crew members.
The number of casualties is unclear. The rescue team searched cold water on Wednesday.
This is the knowledge about crash.
The collision caused an explosion.
The collision was obviously captured in the live network camera video operated by the John Kennedy Performance Art Center, which was a few miles north of the crash scene.
At 8:47 in the evening on the stream, I saw two aircraft hit each other, which led to an explosive fireball, and then there was a smoke. The Federal Aviation Administration said the aircraft had been driving to No. 33 at the Reagan Washington National Airport before the collision.
Several agencies in Washington said they said at the above and down Poto Mark in the Washington Fire Emergency Room at 8:53 pm, saying that the aircraft had fallen into the river.
Officials tried to determine the number of casualties.
The authorities did not formally charge survivors or victims before Wednesday later, because helicopters, police ships, and divers in the water in the water near the airport responded to the crash in batches.
There are 64 people on the ship, and the commercial jet (Bombardier CRJ700) is almost full. This helicopter is the Sikosky H-60 Black Eagle and has been operating in Fort Belvoir, Virginia. A army official could not confirm the status of three crew members later on Wednesday.