Bagdogra Airport also known as Siliguri International Airport is a customs airport serving the city of Siliguri and northern West Bengal, India. It is located in Bagdogra, south-west from the city centre. It is operated as a civil enclave at Bagdogra Air Force Station of the Indian Air Force. It is the gateway to the hill stations of Darjeeling, Gangtok, Kurseong, Kalimpong, Mirik and other parts of North Bengal region. As a major transport hub in the region, the airport sees thousands of tourists annually. The Government of India conferred limited international airport status to the airport in 2002 with limited international operations to Bangkok–Suvarnabhumi and Paro. This is the second busiest airport in West Bengal. The airport experiences humid subtropical climate (Köppen Climate Classification code: Cwa) - hot humid summers and cool winters. There is significant precipitation in all seasons, but remains drier in winters. Air traffic at Bagdogra crossed 1 million for the first time, growing at 43.6% percent in 2014–15. In 2019–20, the airport served 3.2 million passengers, which was an increase of 11.2% from the previous year, making it the 17th-busiest airport in India. It is one of the few airports in India with zero sales tax on aviation turbine fuel. Air Force Station The airbase is home to the IAF No. 20 Wing, as also to the Mikoyan-Gurevich MiG-21 (Mig-21) FL fighter aircraft of the No. 8 Squadron and a Helicopter Unit. Along with the airbase at Hasimara, Alipurduar district; it is responsible for combat air operations over a large area including North Bengal, Sikkim, and if needed, Bhutan. The base caters to all military air traffic for the Indian Army's XXXIII Corps based nearby in Sukna. Expansion The Government of West Bengal had handed over of land to the Ministry of Civil Aviation for developing infrastructure for night landing in 2010. AAI also expanded the apron at the same time, enabling the parking of 5 narrow body aircraft simultaneously. The IAF, which maintains the ATC and runway, gave permission for night landings by civilian aircraft allowing flights past 6 pm in 2013. The new terminal building, which will start its construction by December 2022, will be completed by June 2025 with 16 parking bays, 10 aerobridges and a parallel taxiway to the runway. It will have a floor area of 1 lakh sq.m. at a cost of ₹ 1,884 crore, and will be capable