We rode the Hartsfield-Jackson Atlanta International Airport Train going from T to D. This 4K UHD video gives you an idea of what it is like. This airplane train goes very fast- certainly a helpful attribute for such a large airport as the ATL! We certainly recommend that you arrive 2 hours prior for domestic and 3 hours for international departures for this busy airport. Apparently this is a Bombardier Innovia APM 100 train (thanks to commenter isaghe for the info).
8 авг 2016