Probably an Antonov something or other. I believe they come in once a month or so to pick up freight. Not exactly sure but they could also be picking up parts from the Boeing factory just west of the field
nothing unusual on the schedules so it's probably the C-17 coming back to pick up the presidential vehicles. I saw the C-17 myself right around that time.
Those things are IMPRESSIVE. My first house was under the flight path for Andrews and probably two times a week or thereabouts you would hear the slow steady growl of the one of the Globemasters or a C-5 on climbout - maybe 10,000 feet or so. The engine sound was unmistakable.