Airport Express Line (Delhi Metro)

The Airport Express Line or Orange Line is a line of the Delhi Metro that runs from New Delhi to Yashobhoomi Dwarka Sector-25, linking Indira Gandhi International Airport to the commuter network. The total length of the line is 22.7 km (14.1 mi), of which 15.7 km (9.8 mi) is underground and 7.0 km (4.3 mi) is elevated, spanning from Buddha Jayanti Park to Mahipalpur.

The line runs at a speed of 120 km/h (75 mph) providing for a 15-minute journey from New Delhi to IGI Airport. In 2023, the operational speed of the Airport Express Line was increased to 120 km/h (75 mph) from 110 km/h (68 mph), making it the fastest metro line in the country.

Previously operated by its concessionaire Reliance Infrastructure Ltd, who built the line and invested half of the capital expenditure (the other half was borne by DMRC), it notified DMRC on 27 June 2013 of its inability to operate the line beyond 30 June 2013. Following this, DMRC took over operations of Airport Express line from 1 July 2013, with an operations and maintenance team comprising 100 officials designated to handle the line.