Indira Gandhi International Airport is the primary international airport serving New Delhi, the capital of India, and the National Capital Region. The airport, spread over an area of 5,106 acres, is situated in Palam, Delhi, 15 km southwest of the New Delhi Railway Station and 16 km from New Delhi city centre. Named after Indira Gandhi, the former Prime Minister of India, it is the busiest airport of India in terms of passenger traffic since 2009.