Chhatrapati Shivaji International Airport (CSIA) (IATA: BOM, ICAO: VABB), formerly Sahar International Airport, is the primary international airport in Mumbai, India, and is named after the 17th century Maratha emperor, Chhatrapati Shivaji. The Airport's IATA code – "BOM", is derived from Bombay, Mumbai's former name.
Until and through 2008, it had been the busiest airport in India. However, due to constraints, many airlines have moved their primary Indian gateway to Delhi, and many arallel runway
A second parallel runway was being considered to meet objections raised by the Union Ministry of Environment and Forests against the proposed location of the Navi Mumbai International Airport near Kopra Panvel.
Two alternatives that were mooted by MIAL in the master plan[25] for CSIA:
An east-west runway parallel to the existing runway 09/27 on the southern side. With a length of 12,500 ft (3,800 m), this runway will accommodate new-generation aircraft, and also be sufficiently distant (more than 800 feet (240 m) apart) from the existing runway; it would necessitate the relocation of Air-India's hangars and maintenance facilities.
A second runway parallel to the current cross runway 14/32 on the northern side, between the international terminal to the north and the Kalina campus university grounds. The airport's flight kitchens and the Sahar police station would have to be moved and the area to which they could be relocated is occupied by thousands of slum-dwellers.
The parallel runway remains an active part of the plan but in the meantime the cross runways are being upgraded as much as possible.