AAI board also has part-time members. AAI is divided into five administrative regions, each headed by a Regional Executive Director (RED). AAI having its corporate headquarters at Rajiv Gandhi Bhawan, New Delhi is operating from its five regional headquarters namely- Eastern Regional Headquarter at Kolkata, West Bengal Western Regional Headquarter at Mumbai, Maharashtra Northern Regional Headquarter at Delhi, NCR Southern Regional Headquarter at Chennai, Tamil Nadu North-Eastern Regional Headquarter at Guwahati, Assam. AAI has five training establishments, including three ATS training organizations (ATSTO) viz. The Civil Aviation Training College (CATC) at Prayagraj, Uttar Pradesh. Hyderabad Training Center (HTC) at Hyderabad, Telangana. National Institute of Aviation Training and Management (NIATAM) at Gondia, Maharashtra. Indian Aviation Academy (National Institute of Aviation Management and Research (NIAMAR) at Delhi (a joint venture of Airports Authority of India, Directorate General of Civil Aviation (India) and Bureau of Civil Aviation Security, Govt of India) and Fire Training Centres (FTC) at Delhi & Kolkata. An Aerodrome Visual Simulator (AVS) has been provided at CATC and non-radar procedural ATC simulator equipment is being supplied to CATC Allahabad and Hyderabad Airport. AAI has a dedicated Flight Inspection Unit (FIU) with a fleet of three aircraft fitted with a flight inspection system to inspect Instrument Landing Systems up to Cat-III, VORs, DMEs, NDBs, VGSI (PAPI, VASI) and RADAR (ASR/MSSR). In addition to in-house flight calibration of its navigational aids, AAI undertakes flight calibration of navigational aids for the Indian Air Force, Indian Navy, Indian Coast Guard and other private airfields in the country. Eastern region The Eastern region of AAI controls 20 airports (including 12 non-operational airports) and four aeronautical communications stations. Eastern regional headquarters located in Kolkata, West Bengal, coordinates and controls the entire activities of all the airports and aeronautical communication stations listed below. The Regional Executive Director (RED) of the Airports Authority of India is the Executive Head of the Eastern Region. He is the overall in charge of all activities (Operations, Security, Commercial, Safety, Finance & Administration) of the Eastern Region of the Airports Authority of India. The Eastern Region of the Airports Authority of India is presently headed by Sh. Manoj Gangal, Regional Executive Director. Functions & responsibilities of Eastern regional departments of AAI Communication, navigation and surveillance Among the FIRs (Flight Information Regions) in Indian Airspace, almost one-third of the entire Airspace is controlled/ managed by Kolkata ACC. The responsibility of providing ANS (CNS/ATM)