I don't have much experience with trying to get foreign nationals on site.
Flights are on small turboprop aircraft, but they only take about an hour.
You will pass through Baltimore and go through the Ft. Take Aberdeen Exit 85 onto Route 22. It is advisable to plan about 1 hour non-rush hour travel time from Aberdeen to the airport if you are planning to catch a flight. 22 East to the Aberdeen Proving Ground Harford Gate. Once through the APG entrance gate you are on Harford Blvd.