Question: What  is a low-cost airline headquartered at Gurgaon, that is the largest airline in India, the third largest domestic airline being the flag carrier airline of India ?

Context paragraphs:
Volaris: Volaris, legally "Concesionaria Vuela Compañía de Aviación, S.A.B. de C.V." (BMV: VOLARA, ), is a Mexican low-cost airline based in Santa Fe, Álvaro Obregón, Mexico City with its hub in Guadalajara, Mexico City, and Tijuana, and focus cities in Cancun, Los Angeles, and Monterrey.  It is the country's second largest airline after Aeroméxico and serves domestic and international destinations within the Americas.  It is a leading competitor in the Mexican domestic airline market, with a market share of over 21% of domestic traffic.

Skymark Airlines: Skymark Airlines Inc. (スカイマーク株式会社 , Sukaimāku Kabushiki-gaisha ) is a low-cost airline headquartered at Haneda Airport in Ōta, Tokyo, Japan, operating scheduled passenger services within Japan.  In addition to its base at Haneda, Skymark is the dominant carrier at Kobe Airport and is the only domestic airline operating at Ibaraki Airport north of Tokyo.

Norwegian Air Shuttle: Norwegian Air Shuttle ASA (), trading as Norwegian, is a Norwegian low-cost airline.  It is the third largest low-cost carrier in Europe, the largest airline in Scandinavia, and the ninth-largest airline in Europe in terms of passenger numbers.  It offers a high-frequency domestic flight schedule within Scandinavia and Finland, and to business destinations such as London, as well as to holiday destinations in the Mediterranean and the Canary Islands, transporting over 30 million people in 2016.  The airline is known for its distinctive livery of white with a red nose, with portraits of distinguished Scandinavians on the tail fins of its aircraft.

Air India: Air India is the flag carrier airline of India.  It is owned by Air India Limited, a government-owned enterprise, and operates a fleet of Airbus and Boeing aircraft serving 90 domestic and international destinations.  The airline has its hub at Indira Gandhi International Airport, New Delhi, alongside several focus cities across India.  Air India is the largest international carrier out of India with an 18.6% market share.  Over 60 international destinations are served by Air India across four continents.  Additionally, the carrier is the third largest domestic airline in India in terms of passengers carried (after IndiGo and Jet Airways) with a market share of 13.5% as of July 2017.  The airline became the 27th member of Star Alliance on 11 July 2014.

History of British Airways: British Airways (BA) is the flag carrier airline of the United Kingdom.  It is the largest airline in the UK based on fleet size, international flights and international destinations.  British Airways was considered the largest UK airline by passenger numbers from its creation in 1974 until 2008, when it was displaced by low-cost rival EasyJet.  Since its inception, British Airways has been centred at its main hub at London Heathrow Airport, with a second major hub at London Gatwick Airport.

IndiGo: IndiGo is a low-cost airline headquartered at Gurgaon, Haryana, India.  It is the largest airline in India by passengers carried and fleet size, with a 38.7% market share as of July 2017.  It is also the largest individual Asian low-cost carrier in terms of jet fleet size and passengers carried, and the eighth largest carrier in Asia with over 41 million passengers carried in 2016.  The airline operates to 46 destinations both domestic and international.  It has its primary hub at Indira Gandhi International Airport, Delhi.

Vistara: Tata SIA Airlines Limited, operating as Vistara, is an Indian domestic airline based in Gurgaon with its hub at Delhi-Indira Gandhi International Airport.  The carrier, a joint venture between Tata Sons and Singapore Airlines, commenced operations on 9 January 2015 with its inaugural flight between Delhi and Mumbai.  The airline had carried more than two million passengers by June 2016 and as of May 2017, has a 3.3% share of the domestic carrier market, making it the 6th largest domestic airline.  The airline operates to nineteen destinations with a fleet of Airbus A320-200 aircraft.  Vistara was the first airline to introduce premium economy seats on domestic routes in India.

SpiceJet: SpiceJet is a low-cost airline headquartered in Gurugram, India.  It is the third largest airline in the country by number of domestic passengers carried, with a market share of 14.2% as of July 2017.  The airline operates 312 daily flights to 55 destinations, including 45 Indian and 10 international destinations from its hubs at Delhi, Kolkata and Hyderabad.

AirAsia: AirAsia Berhad () is a Malaysian low-cost airline headquartered near Kuala Lumpur, Malaysia.  It is the largest airline in Malaysia by fleet size and destinations.  AirAsia Group operates scheduled domestic and international flights to more than 165 destinations spanning 25 countries.  Its main hub is klia2, the low-cost carrier terminal at Kuala Lumpur International Airport (KLIA) in Sepang, Selangor, Malaysia.  Its affiliate airlines Thai AirAsia, Indonesia AirAsia, Philippines AirAsia, and AirAsia India have hubs in Don Mueang International Airport, Soekarno–Hatta International Airport, Ninoy Aquino International Airport, and Kempegowda International Airport respectively, while its sister airline, AirAsia X, focuses on long-haul routes.  AirAsia's registered office is in Petaling Jaya, Selangor while its head office is at Kuala Lumpur International Airport.

China Airlines: China Airlines (CAL) () () is the flag carrier and largest airline of the Republic of China (Taiwan).  It is headquartered in Taoyuan International Airport and has 12,607 regular employees.  China Airlines operates over 1,400 flights weekly to 118 airports in 115 cities (including codeshare) across Asia, Europe, North America and Oceania.  The cargo division operates 91 pure freighter flights weekly.  The carrier was, in 2013, the 29th and 10th largest airline in the world in terms of passenger revenue per kilometer (RPK) and freight RPK, respectively.  China Airlines has three airline subsidiaries: Mandarin Airlines operates flights to domestic and low-demand regional destinations; China Airlines Cargo, a member of Skyteam Cargo, operates a fleet of freighter aircraft and manages its parent airline's cargo-hold capacity; Tigerair Taiwan is a low-cost carrier established by China Airlines and Singaporean airline group Tigerair Holdings and is wholly owned by China Airlines Group.

Supporting paragraphs: Air India IndiGo
Answer: IndiGo