Print a boarding pass - the mobile doc scanner at security is constantly "out of battery power" and you'll have to go back and print your boarding pass
Seems to have good luck at BWI. Just checked my 67lb bag with no problem on SW and got through security in 15 min. If the security line is long, try downstairs. It's never really crowded.
If you're an evening arrival, have your people pick you up upstairs at departures; Few are there that late and no one is hassling you to move your car and it's much easier to spot your pick up.
If you need to fill up the rental car gas tank better do it before you take the airport exit. There is none to be found anywhere near the car rental facility.
Baltimore/Washington International Thurgood Marshall Airport is an international airport serving the Baltimore-Washington Metropolitan Area in the United States.