The Airports Authority of India (AAI), under the Ministry of Civil Aviation is responsible for creating, upgrading, maintaining and managing civil aviation infrastructure in India. AAI provides Air traffic management (ATM) services over Indian Airspace and adjoining oceanic areas. It also manages a total of 129 Airports, including 20 International Airports, 8 Customs Airports, 78 Domestic Airports and 20 Civil enclaves at Military Airfields and covers all major air-routes over Indian landmass. AAI also has ground installations at all airports including 25 other locations, Radar installations at 11 locations along with 700VOR/DVOR installations colocated with Distance Measuring Equipment (DME) to ensure safety of aircraft operations. Runways are provided with Instrument landing system (ILS) installations with Night Landing Facilities and Automatic Message Switching System at various Airports.

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