IndiGo Airlines (operated by Interglobe Aviation Limited) is an Indian low-cost carrier and the largest airline by passengers carried and fleet size, with a 49.9 per cent domestic market share as of April 2019. At the time, the airline operated more than 1,000 daily flights to 66 destinations, 51 in India and 15 abroad, with its main base in Delhi and additional bases at Bangalore, Chennai, Hyderabad, Kolkata, Mumbai, Jaipur and Ahmedabad.
In January 2011, IndiGo Airlines received the licence to operate international flights after completing five years of operations, and it launched its first international service between New Delhi and Dubai on 1 September 2011.
The airline was founded as a private company by Rahul Bhatia of InterGlobe Enterprises and Rakesh Gangwal, in 2006. InterGlobe had a 51.12% stake in IndiGo, while 47.88% was held by Gangwal's Virginia-based company Caelum Investments.
IndiGo Airlines commenced operations on 4 August 2006 with a service from New Delhi to Imphal via Guwahati. In December 2010, IndiGo replaced state-run carrier Air India as the third-largest airline in India, behind Kingfisher Airlines and Jet Airways with a passenger market share of 17.3%. The airline became the largest Indian carrier in passenger market share in 2012.
In 2011, IndiGo placed an order for 180 Airbus A320 aircraft in a deal worth $15 billion. The same year, the airline got the permission to launch international flights. On 17 August 2012, IndiGo became the largest airline in India in terms of market share, surpassing Jet Airways.
In January 2013, IndiGo became the second-fastest-growing low-cost carrier in Asia, next only to Indonesian airline Lion Air. In August 2015, IndiGo placed an order of 250 Airbus A320neo aircraft worth $27 billion, the largest single order ever for Airbus. IndiGo announced a $460-million initial public offering (IPO) on 19 October 2015, which opened on 27 October 2015.