Reaping the Whirlwind | Inside the Potomac River Midair Collision

Admiral Cloudberg is always a good read.

edit: wow I'm only halfway through and this is a good one. As usual Cloudberg goes deep into the surrounding circumstances.

So many good quotes in this article, but this is the thing that stuck out to me most right after the accident:

In fact, a helicopter traversing Route 4 along the eastern shore of the Potomac River at the maximum altitude of 200 feet would pass just 75 feet below the optimal 3-degree glide path into runway 33. Away from the shore, this margin further reduces toward zero at a rate proportional to one’s charitableness in interpreting the location of the route’s undefined western boundary.