With 1.5 billion people travelling by air each year, lethal tropical infections and pathogens we thought we had eradicated are hitching a ride. In this program, case studies of West Nile virus, Chagas disease, tuberculosis, and Hanta virus—only a ten-hour flight away from unsuspecting populations around the globe—illustrate the scope of the danger, while the doctors and health officials on the frontlines explain the battle. Interviews with Ben Beard, of the CDC; Deborah Asnis, M.D., infectious disease specialist at Flushing Hospital Medical Center; and Francis Drobniewski, of the U.K. Public Health Laboratory Service, are included, among others. A Discovery Channel Production. (51 minutes)