in poor visibility. In August 2014, it was announced that the instrument landing system of the primary runway would be upgraded to CAT-IIIb. This allows flights to operate till visibility drops below 50 metres. The secondary runway would be upgraded to CAT-II. The upgrading work started in February 2015 and was completed in January 2018. The modernisation plan included some improvements of the airport's existing terminals, including the addition of extra ticketing counters, check-in kiosks, and cafes to the domestic terminal in 2009. However, the need to replace the airport's terminals entirely led to plans for a new integrated terminal, known as T2 to differentiate it from the older domestic block, to serve both international and domestic destinations. A Thai-based company, the Italian-Thai Development (ITD) Corporation (ITD-ITDCem JV, a consortium of ITD and ITD Cementation) and the 125-year-old iconic Project Management Consultant–Parsons Brinckerhoff (PB) was hired with Delhi-based designer Sikka Associates to construct the building. Construction commenced in November 2008, and T2 was inaugurated on 20 January 2013 after overshooting the previous deadlines of July 2011 and August 2012. The former airport hotel 'Ashok' was demolished to give way for two new five-star luxury hotels and a shopping mall in its place. Commercial operations were intended to start on 23 January 2013, the 116th birth anniversary of Netaji Subhas Chandra Bose. However, the shift to the new terminal was only completed on 16 March 2013. Airports Council International named it the best improved airport in the Asia-Pacific region in 2014 and 2015. Infrastructure Runways The airport has two parallel runways, The primary runway 01R/19L has a capacity of 35 flights per hour and the secondary runway 01L/19R has a capacity of 15 flights per hour. The secondary runway is used as a taxiway and the main runway is mainly used. When the primary runway is shut down for maintenance, the secondary runway is used. Hangars and ground services Air India operates hangars at the airport, while Bharat Petroleum and Indian Oil act as fuellers. Catering facilities are owned by Taj-Sats and Oberoi Flight Services. Terminals The airport's new integrated terminal T2 is spread over and can handle 25 million passengers annually, compared to the previous terminals' capacity of five million. The terminal is an L-shaped structure, containing six levels. It contains 128 check-in counters that utilise CUTE (Common User Terminal Equipment) technology and has 78 immigration counters and twelve customs