Planefag just arrived. Aircraft callsign DARK21 flying over Arlington and Hyattsville now. Any other planefags on watch?

Plane DARK21 just landed at Andrews AFB. Possible event on the horizon.Three American Eagle flights also landed together at Ronald Reagan today. Might be unrelated but worth a mention.

DARK21 appears to be an F15 (Tactical) according to an entry on Radarbox. Could be just Navy traffic but am watching Dulles/RR/Andrews just in case.

Two helos in formation on the move towards Arlington / Washington.