"Airport rail links have long been popular in Europe and Asia. But only eight of the 20 largest U.S. airports, based on 2008 boardings, have rail service that drops passengers off within walking distance of the terminals: Atlanta, Chicago O'Hare, New YorkJohn F. Kennedy, San Francisco, Newark, Minneapolis, Boston and Philadelphia.
But a confluence of operational and economic factors have pushed the airport rail agenda forward in recent years despite opposition from taxi and bus proponents and fiscally conservative lawmakers.
With air traffic rising rapidly in recent years, airports are learning that simply building more parking lots and enlarging roadways aren't sustainable practices, [Matthew Coogan, director of New England Transportation Institute] says. Many U.S. airports have also embraced the green movement, budgeting more for programs that reduce their carbon footprint."