I hope they figure out what went wrong here. In fact I know they will - the NTSB is really good at deciphering all the data that leads to this sort of thing.
So much sadness and loss...
I know there will be fault finding, but that is what an AAR is all about.
That said, I'm not a pilot, but if I'm flying a helicopter near Reagan, I would be really careful about the commercial flights into and out of Reagan. I mean, their flight routes into and out of Reagan are pretty predictable. If memory serves, they follow the river.
Plus, a helicopter is more flexible. It can ascend or descend pretty much on a dime.
Mrs. Tidewater read an article in which it stated that ATC had told the helicopter that an American flight was inbound and asking if the helicopter crew saw it.
There are a lot of lights, so I bet they were not flying with Night Observation Devices (too much light for NODs) but I suppose the helicopter crew lost the AA flight in the background city lights.
Sad and tragic all around.