The construction of the Airport Express Metro Line, which will link Mumbai's Chhatrapati Shivaji Maharaj International Airport (CSMIA) to the upcoming Navi Mumbai International Airport, is scheduled to start soon as the Navi Mumbai International Airport gains momentum. The two development organisations in the Mumbai Metropolitan Region, CIDCO and MMRDA, will construct the 35 kilometre metro line. While the Mumbai Metropolitan Region Development Authority (MMRDA) would handle the project in the Mumbai area, the City and Industrial Development Corporation (CIDCO) will carry out the metro line construction in the Navi Mumbai area. Since 2014, the projected Metro 8 corridor has been included in the MMRDA's Metro Master Plan. Between these two airports, there is currently no mass rapid transit system (MRTS). A senior member of the state government remarked, that the Navi Mumbai Airport is anticipated to open for business in 2025. We might set up the Metro 8 corridor's execution plan right now, so that the line is ready when the airport traffic picks up. Airport Express Metro Line will have both underground and elevated sections. The metro length is anticipated to be built for around Rs 150 billion, and it anticipates around nine lakh daily passengers. On this line, there won't be many services every hour, but experts say that considering airline schedules, a low frequency of services will be adequate. According to the proposed route, the line will be partially elevated and partially buried. Between Andheri and the Eastern Expressway in Ghatkopar, it is anticipated to be underground. From there, it will use the elevated route via the Ghatkopar-Mankhurd Link Road till it reaches Mankhurd. In October 2022, MMRDA asked CIDCO to create a detailed project report (DPR) for the sections of Mumbai Metro Line 8 from Belapur to Navi Mumbai Airport and from Mankhurd to Sagar Sangam on Navi Mumbai Metro Line 1-A. An earlier version of MMRDA's proposal called for building this route only as far as Mankhurd, after which it would be combined with the CSMT-Panvel high-speed corridor. The idea was to construct an 8.5 km loop that would run from Seawoods to the Navi Mumbai airport. Unfortunately, due to the railway ministry's decision to withdraw the CSMT-Panvel high-speed corridor plan from Mumbai Urban Transport Project 3A for review, this was unable to happen.