There's a small upstart AFF program at Skydive Baltimore that meets on Saturdays. Try calling the DZ and ask if they're still taking students.
If that doesn't work out, other options for AFF are about 2 hours away from Baltimore, just slightly out of state. I know of Delmarva, Orange, Chambersburg, and Cross Keys.
If you're willing to do an IAD progression instead of AFF, Maytown is up I-83 in PA.
Skydive Baltimore doesn't really do fun jumpers, so you're going to wind up at one of these DZs eventually if you stick with it.
