was made permanent. When the World Trade Center station was destroyed in the September 11 attacks, which also required the closing of Exchange Place, service on the Newark–World Trade Center line had to be changed. On weekdays, trains ran between either Newark Penn Station and 33rd Street or Hoboken Terminal. On weekends, trains ran between Newark Penn Station and 33rd Street with Hoboken Terminal as an interim stop. Express service was suspended indefinitely. During overnight hours daily, trains ran between Newark and 33rd Street via Hoboken and was the only branch operating on PATH during those times. When Exchange Place reopened on June 29, 2003, service ran between Newark and that station daily around the clock. Service to World Trade Center was restored on November 23 when the temporary station opened. However, the express service was never restored. After Hurricane Sandy flooded the PATH system in October 2012, service on the line was suspended. For most of November, trains ran between Newark Penn Station and 33rd Street. The Journal Square–33rd Street line was temporarily extended to cover service on the Newark–World Trade Center line. Limited weekday-only service on the line was resumed on November 26, 2012, but full service would not be restored until early 2013. Starting on January 5, 2019, service on the Newark–World Trade Center line between Exchange Place and World Trade Center was to be suspended during almost all weekends through at least 2020 for Sandy-related repairs to the Downtown Hudson Tubes except on holiday weekends. Passengers wanting to travel to New York City from Newark during this time must transfer to the Journal Square–33rd Street (via Hoboken) service at either Journal Square or Grove Street. However, weekend service was restored in June 2020, six months ahead of schedule. In June 2019, the Port Authority released the PATH Improvement Plan. As part of the plan, every train on the NWK–WTC route will consist of 9-car trains, and the Port Authority would study proposals to extend NWK–WTC trainsets to 10 cars. To accomplish this, the platform at Grove Street will be extended at the Marin Blvd. end of the station. The train lengthenings, combined with the installation of communications-based train control and the delivery of additional rolling stock, could increase NWK–WTC capacity by up to 40%. Newark Airport extension On February 4, 2014, the Port Authority proposed a 10-year capital plan that included an extension of PATH southwest