Why This D.C. Helicopter Route Has Worried Pilots for Years | WSJ

An Army Black Hawk helicopter collided with an American Airlines plane in Washington D.C. near the Reagan National Airport, killing 67 people on Tuesday night. The plane crash happened in one of the U.S.’s most restricted air spaces.

A WSJ visual investigation breaks down the helicopter corridors, airport runway paths and light pollution that may have played a role in the fatal D.C. crash.