Delhi Airport has three near-parallel runways: runway 11/29, 4,430 m × 60 m (14,530 ft × 200 ft) with CAT IIIB instrument landing system (ILS) on both sides, runway 10/28, 3,810 m × 46 m (12,500 ft × 151 ft), and runway 09/27, 2,813 m × 45 m (9,229 ft × 148 ft).
In addition to Chaudhary Charan Singh International Airport in Lucknow and Jaipur Airport in Jaipur, Delhi Airport is the only airports in India to have been equipped with the CAT III-B ILS.
In the winter of 2005, there were a record number of disruptions at Delhi airport due to fog/smog.
Since then some domestic airlines have trained their pilots to operate under CAT-II conditions of a minimum 350 m (1,150 ft) visibility.
On 31 March 2006, IGI became the first Indian airport to operate two runways simultaneously following a test run involving a SpiceJet plane landing on runway 28 and a Jet Airways plane taking off from runway 27 at the same time.

The initially proposed mode involving simultaneous takeoffs in westerly flow to increase handling traffic capacity caused several near misses over the west side of the airport where the centrelines of runways 10/28 and 9/27 intersect.
The runway use was changed to segregate dependent mode on 25 December 2007, which was a few days after the deciding near miss involving an Airbus A330-200 of Qatar Airways and an Indigo A320 aircraft.
The new method involved use of runway 28 for all departures and runway 27 for all arrivals.
This mode which was more streamlined was adopted during day hours (0600 – 2300 IST) till 24 September 2008.

On 21 August 2008, the airport inaugurated its 3rd runway 11/29 costing ₹10 billion and 4,430 m (14,534 ft) long.
The runway has one of the world's longest paved threshold displacements of 1,460 m (4,790 ft).
This, in turn decreases the available landing length on runway 29 to 2,970 m (9,744 ft).
The purpose of this large threshold displacement is to reduce noise generated by landing aircraft over nearby localities.
The runway increases the airport's capacity to handle up to 100 flights from the previous 45–60 flights per hour.
The new runway was opened for commercial operations on 25 September 2008 and gradually began full round-the-clock operations by the end of October the same year.

Since mid 2012 all three runways are operated simultaneously to handle traffic during day hours.
Only runways 11/29 and 10/28 are operated during night (2300–0600 IST) hours with single runway landing restriction during westerly traffic flow that is rotated late night (0300 IST) and reversed weekly to distribute and mitigate night time landing noise over nearby residential areas.

To cater for the demand of increasing air traffic, the master plan for the construction of a fourth parallel runway next to the existing runway 11/29 has been cleared.
Delhi Airport has three near-parallel runways: runway 11/29, 4,430 m × 60 m (14,530 ft × 200 ft) with CAT IIIB instrument landing system (ILS) on both sides, runway 10/28, 3,810 m × 46 m (12,500 ft × 151 ft), and runway 09/27, 2,813 m × 45 m (9,229 ft × 148 ft). In addition to Chaudhary Charan Singh International Airport in Lucknow and Jaipur Airport in Jaipur, Delhi Airport is the only airports in India to have been equipped with the CAT III-B ILS. In the winter of 2005, there were a record number of disruptions at Delhi airport due to fog/smog. Since then some domestic airlines have trained their pilots to operate under CAT-II conditions of a minimum 350 m (1,150 ft) visibility. On 31 March 2006, IGI became the first Indian airport to operate two runways simultaneously following a test run involving a SpiceJet plane landing on runway 28 and a Jet Airways plane taking off from runway 27 at the same time.
The initially proposed mode involving simultaneous takeoffs in westerly flow to increase handling traffic capacity caused several near misses over the west side of the airport where the centrelines of runways 10/28 and 9/27 intersect. The runway use was changed to segregate dependent mode on 25 December 2007, which was a few days after the deciding near miss involving an Airbus A330-200 of Qatar Airways and an Indigo A320 aircraft. The new method involved use of runway 28 for all departures and runway 27 for all arrivals. This mode which was more streamlined was adopted during day hours (0600 – 2300 IST) till 24 September 2008.
On 21 August 2008, the airport inaugurated its 3rd runway 11/29 costing ₹10 billion and 4,430 m (14,534 ft) long. The runway has one of the world's longest paved threshold displacements of 1,460 m (4,790 ft). This, in turn decreases the available landing length on runway 29 to 2,970 m (9,744 ft). The purpose of this large threshold displacement is to reduce noise generated by landing aircraft over nearby localities. The runway increases the airport's capacity to handle up to 100 flights from the previous 45–60 flights per hour. The new runway was opened for commercial operations on 25 September 2008 and gradually began full round-the-clock operations by the end of October the same year.
Since mid 2012 all three runways are operated simultaneously to handle traffic during day hours. Only runways 11/29 and 10/28 are operated during night (2300–0600 IST) hours with single runway landing restriction during westerly traffic flow that is rotated late night (0300 IST) and reversed weekly to distribute and mitigate night time landing noise over nearby residential areas.
To cater for the demand of increasing air traffic, the master plan for the construction of a fourth parallel runway next to the existing runway 11/29 has been cleared.
Indira Gandhi International Airport