Potomac Riverkeeper Network members are concerned about the potential environmental impact from the Jan. 29 plane-copter crash in the Potomac River.

Here's a look at the collision: American Airlines Flight 5342 from Wichita ... got an alert saying the plane and Black Hawk were converging and asked the helicopter if it had the jet in sight.

That technology — referred to as ADS-B Out, for Automatic Dependent Surveillance-Broadcast Out — was not operating in the Black Hawk helicopter ... flight 5342 from Wichita to Washington ...

American Airlines Flight 5342 from Wichita, Kansas ... Salvage crews pull up a part of a Black Hawk helicopter near the site in the Potomac River of a mid-air collision between an American ...