Gates 10-22: choose the outside or furthest inside security lines. Far right is straight w/ no turns, so you can judge distance. Far left turns, but has most scanner lines to choose from.
B concourse Gate 12 has a power station to recharge. Plug-ins in walls around Gate 14 nonfunctional 4-9-11 except for ones in a tiny alcove at the end of 14 nearest the moving walkways.
Picking up people can be a nightmare since cars tend to park and not move even if their person hasn't come out yet. Expect people to have to come out past the first lane to be picked up.
Always bring earplugs, even if you aren't planning on sleeping. They prevent flying stressed caused by screaming children, seat mates that talk too much, and ear pressure buildup, if you have a cold!
Location is convenient and the security lines are usually a lot shorter than dulles. American terminal has the best food options - southwest used to be the worst, but I think they are renovating it.
Need to get to the car rentals? Door 4, top floor (go UP a level after you get off the plane). Signage is terrible. Pro-tip: walk inside, it takes a while.
The lady who said this is an international airport is wrong. It is a domestic airport with no customs or immigration facilities. The only international flights are a few to Canada & the Caribbean.
If you call it "national" to a cabbie, good luck getting to the airport without a confusing conversation. Quit pretending to have lived here for years, people.