The NTSB published video showing officials at the site of the fatal Jan. 31 plane crash in Philadelphia, which killed at least seven people and injured 22 others.
An American Airlines regional jet collided with a U.S. Army Black Hawk helicopter on Jan. 29. Both aircraft plunged into the Potomac River near Reagan Airport.
The NTSB is an independent federal agency responsible for investigating all civil aviation accidents as well as serious incidents in the U.S. involving other modes of transportation, such as ...