AirTrain Newark is a 3-mile (4.8 km) monorail system connecting Newark Liberty International Airport (EWR) to the Newark Liberty International Airport train station on the Northeast Corridor (NEC) rail line of New Jersey Transit and Amtrak. Originally serving only as an airport circulator, a service which allows passengers to transfer between airport terminals or concourses, the monorail track was refurbished and extended to the NEC, with construction beginning in 1997. The system reopened for service on October 21, 2000. The contract to build the system was awarded to Von Roll AG, but the project was finished by Adtranz, who acquired Von Roll's monorail division while the system was being built. Adtranz was later acquired by Bombardier Transportation, who continues to operate the AirTrain under contract to the Port Authority of New York and New Jersey, the operator of the airport.
Automated announcements recorded by traffic reporter Bernie Wagenblast tell riders which airlines can be found in each terminal.
In 2007, the average daily paid ridership was 4,930.