[20] The Urban Development Ministry subsequently disclosed that several clips in the underground section have been seriously damaged and it will take at least 5 months to rectify the problem.

[21] A joint inspection by Delhi Metro and Reliance Infrastructure team has revealed that 540 bearings need rectification and some girders which have cracked also need to be recast.

[23] At the original speed of 100 km/h (62 mph), the journey from New Delhi Metro Station to Airport takes just 20 minutes.

The stations have full-height platform screen doors to prevent untoward incidents and to provide better air conditioning.

While originally expected to carry 42,000 people daily by 2011 as per detailed project report prepared by DMRC, actual ridership has hovered around 20,000.

[1] The fare for commuting has been fixed at ₹60 (69¢ US) for travel from New Delhi metro station to IGI Airport / Dwarka Sector 21.

[33] In April 2020, DMRC published a notice for procuring a SCADA System at the line's Operational Control Centre (OCC)[34] Eight six-car trains supplied by CAF Beasain were imported from Spain.

[13] The trains on this line are of a premium standard and have in-built noise reduction features for a noise-free ride with padded fabric seats.

The trains are fitted with an event recorder which can withstand high levels of temperature and impact and the wheels have flange lubrication system for less noise and better riding comfort.

[35] The 7 km elevated section from Buddha Jayanti Park to Mahipalpur has been built with 25 m long girders for the first time in India.

Passengers flying with Air India and Vistara which use T3 terminal as base of operations can check in at the New Delhi Metro Station.

Passengers flying for international flights also started checking in as this facility from 22 February 2012, however that has been stopped since COVID.

[36] Delhi Metro Rail Corporation has introduced QR code-based ticketing facility for travel on Airport Express Line from September 2018.

[37] The system will enable passengers to purchase tickets using 'Ridlr mobile App' without physically coming to the metro station.

[39] Postal services can be availed by both commuters and non-commuters as the counter is located at the non-paid area of New Delhi metro station's concourse level.