MacArthur is the only airport in Nassau or Suffolk counties with regularly scheduled commercial flights, handling about 2 million passengers a year.The most notable of these are the Northeast Corridor's East River Tunnels used by Amtrak and the Long Island Rail Road to connect to Pennsylvania Station in Manhattan.[clarification needed] The Long Island Rail Road is the second busiest commuter railroad system in North America, carrying in 2012 an average of 282,400 customers each weekday on 728 daily trains.[1] It was once the largest commuter rail in the U.S. but following three successive years of declines was replaced at the close of 2012 by the Metro-North railroad that services areas north of New York City.[4] It is a publicly owned system, operated by the Metropolitan Transportation Authority, under the name MTA Long Island Rail Road.