 Massive volume at major airports, it might be useful to add an extra hour or more. Give you time to eat, too, if you're hungry. Especially if you're traveling internationally or checking a bag, you might be looking at three or more hours of lead time just to be safe. I'm a planner, so I'd say two hours. Pack snacks, good books, something to read. Wishing you a safe flight, Matt Koufax. WTOP News.