Skyline (Honolulu)

Skyline is a light metro rapid transit system in the City and County of Honolulu on the island of Oʻahu, in the state of Hawaiʻi. Segment 1 of the project, which lies entirely outside of the Urban Honolulu census-designated place, opened on June 30, 2023 linking East Kapolei (on the ʻEwa Plain) and Aloha Stadium in Hālawa. Segment 2, connecting to Pearl Harbor, Daniel K. Inouye International Airport and Middle Street, opened on October 16, 2025. Segment 3, continuing the line across Urban Honolulu to Downtown, is due to open in 2031. The construction of Skyline constitutes the largest public works project in Hawaiʻi's history. The 18.9-mile (30.4 km), automated fixed-guideway line was planned, designed, and constructed by the Honolulu Authority for Rapid Transportation (HART), a semi-autonomous government agency. Hitachi Rail, who also built the railcars used on the line, operates Skyline for the Honolulu Department of Transportation Services (which also manages the island's TheBus service). The almost entirely elevated line is the first large-scale, publicly run metro in the United States to feature platform screen doors and driverless trains. In 2025, the line had an annual ridership of 1,696,800, or about 11,600 per day as of the second quarter of 2026, compared to the 25,000 per day that was predicted in 2023.