Question: How many destinations are served by the airline that Indian merged into on 26 February 2011?

full_context: Document 1: Federation of Indian Airlines: The Federation of Indian Airlines (FIA) is an airline industry body in India. Its members are Jet Airways, IndiGo, SpiceJet and GoAir. As of March 2017, the four members of the FIA have a combined 80% share of the domestic aviation market. The functions of the FIA are carried out by an Executive Council composed of the heads of each of the member airlines.
Document 2: 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.
Document 3: Indian Airlines Flight 605: Indian Airlines Flight 605 was a scheduled domestic passenger flight, flying from Chhatrapati Shivaji International Airport in India's largest city of Bombay (present day Mumbai) to Hindustan Airport in Bangalore, the capital of Indian state of Karnataka. On 14 February 1990, the aircraft involved in the crash, an Airbus A320-231 registered in India as VT-EPN, crashed onto a golf course while on a landing attempt on Bangalore International Airport, killing 92 people.
Document 4: Air India Building: The Air India Building is a 23-storey commercial tower on Marine Drive in Nariman Point, Mumbai, India. The building served as the corporate headquarters for the Indian national airline, Air India, up to 2013. There are at least 10800 sqft of space on each floor of the building. In February 2013, Air India officially vacated the building as part of its asset-monetisation plan, and shifted its corporate office to New Delhi. The Indian Airlines House was chosen as the airline's new headquarters. However, the airline still retains the 21st, 22nd and 23rd floors in the building.
Document 5: Air India Limited: Air India Limited is a company that was formed as National Aviation Company of India Limited by the government of India to oversee the merger of Air India and Indian. The company was renamed as Air India Limited on 26 October 2010. It was incorporated under the Companies Act 1956 on 30 March 2007 and was owned by the Government of India based at the Air India Building in Nariman Point, Mumbai. The Company was created to facilitate the merger of the two main state-owned airlines in India: Air India, with its subsidiary Air India Express and Indian, together with its subsidiary Alliance Air (was called Air India Regional for about 6 years from 2011 to March 2017).
Document 6: Air India destinations: Air India flies to the following destinations as of January 2017. This list does not contain destinations served by subsidiaries Air India Express or Alliance Air. For all the destinations ever served by Air India, see the Air India timeline from 1932 to 2011
Document 7: Indian Airlines flight 814 hijacking: Indian Airlines Flight 814 commonly known as IC 814 was an Indian Airlines Airbus A300 en route from Tribhuvan International Airport in Kathmandu, Nepal to Indira Gandhi International Airport in Delhi, India on Friday, 24 December 1999, when it was hijacked. Harkat-ul-Mujahideen was accused of the hijacking.
Document 8: Indian Airlines destinations: Indian served the following destinations before being merged into Air India on 26 February 2011:
Document 9: 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.
Document 10: Deccan Airways Limited: Deccan Airways Limited was a commercial airline based in Hyderabad. Founded in 1945, it was one of the nine airlines existing in India during independence. The airline, a joint venture of Nizam Government of erstwhile Hyderabad State and Tata Airlines was launched with a fleet of three aircraft. By the time it was merged with Indian Airlines in 1953, it had a fleet of thirteen Douglas DC-3 'Dakota' aircraft. The airline operated on Madras-Hyderabad-Nagpur- Bhopal-Gwalior-Delhi, Hyderabad-Bombay and Hyderabad-Bangalore sectors.
Document 11: Air India One: Air India One (also referred to as AI-1 or AIC001) is the call sign of any aircraft with the Prime Minister or President of India on board. Air India is the national airline of India. The aircraft is operated as VIP flight by the Indian Air Force (IAF). The IAF's Air Headquarters Communication Squadron, based at Indira Gandhi International Airport (formerly Palam Air Force Base) in New Delhi, is in charge of operating these aircraft.
Document 12: Indian Airlines: Indian Airlines, later Indian (Indian Airlines Limited from 1993 and Indian Airlines Corporation from 1953 to 1993), was a major Indian airline based in Delhi and focused primarily on domestic routes, along with several international services to neighbouring countries in Asia. It was state-owned, after merger of eight pre-Independence domestic airlines and was administered by the Ministry of Civil Aviation. Indian was formerly one of the two flag carriers of India, the other being Air India.
Document 13: Air India Express: Air India Express is an Indian low-cost carrier headquartered in Kochi. It is operated by Air India Express Limited (AIEL), a wholly owned subsidiary of flag carrier airline Air India. It operates around 550 flights per week to 29 destinations including the Middle East and Southeast Asia.
Document 14: 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.
Document 15: Air India Cargo: Air India Cargo was a cargo airline, it was the freight carrying subsidiary of Air India, based in Mumbai. It operated freighter aircraft services off and on at different stages of its history, the latest being from 2006 to 2012. Although the company has stopped operating as an airline it continues to manage the belly cargo hold capacity of Air India's passenger fleet.
ground_truth: 60 international destinations