A few days ago there was an orange box saying average delays at the airport chosen to be viewed. Now, it’s gone. Will this feature be back?
Now it’s back. Nevermind…
New delay type causing some issues on our end. We’re working on it.
It’s back, including KDCA closed until tomorrow morning.
Nope, not seeing it. 
Good news, the FAA declares no delays at KDCA and KIAD, despite them receiving a combined 9 flights since 7am!
When everything is canceled, there is no meaningful delay or need for ground stops.
That does look pretty odd on the map…with this happening.
ATCSCC ADVZY 045 DCA/ZDC GROUND STOP
DESTINATION AIRPORT: DCA
FACILITIES INCLUDED: ALL
EXPECT UPDATE: UFN, DCA AIRPORT AUTHORITY IS CLOSING THE AIRPORT AND
A NOTAM CLOSING THE AIRPORT IS PENDING.
REASON: DCA RUNWAYS ARE SNOW COVERED.
191708-191859
09/12/19 17:09
Edit: looks like they closed the runways/taxiways only, not the airport, to accomodate helicopters.
Closure is back for KIAD/KBWI.
You can now see all the current flight delays by airport at flightaware.com/live/airport_delays.rvt