[2] The monorail tracks were soon thereafter extended to the Northeast Corridor, with construction on that project beginning in 1997; the extension opened on October 21, 2001.

[10] Adtranz was responsible for paying the $25 million in repairs, and temporary shuttle buses provided service in lieu of the monorail during the shutdown period.

[16] In April 2015, the PANYNJ suggested that initial work to replace the system would cost $40 million in consultant and engineering studies.

[17][18][19][5] In 2017, the Port Authority decided to include the then $1.7 billion PATH extension to the Newark Liberty International Airport "RailLink" station in their 2017 10-year capital plan, while the AirTrain was given $300 million for maintenance and repairs.

[20] However, in January 2019, New Jersey Governor Phil Murphy announced a plan for a $2 billion replacement project for the AirTrain.

Murphy has stated that replacement is necessary because the system is reaching the end of its projected 25-year life and is subject to persistent delays and breakdowns.

[16] In October 2019, the Port Authority's Board of Commissioners approved the AirTrain Newark Replacement Project, with an estimated cost of $2.05 billion.

[21] A draft environmental impact statement was completed in February 2021 when the proposed opening date was shifted to 2026.

[34] Automated announcements recorded by former traffic reporter Bernie Wagenblast tell riders which airlines can be found in each terminal, as well as available connections at other stations.

[39] AirTrain Newark operates using 18 Von Roll Mk III trainsets, each train consisting of 6 cars.