How to go to 2nd floor at BWI?

Is this your firs time flying? In the USA all international airports in large metropolitan areas have elevators, escalator & stairs. This makes them accessable to people w certain disabilities, which happens to be the law of the land as well. Even if there is no elevator in a pubic area the airport has staff who will escort you to a working elevator in a non-public access area of the airport. You will have no problem.