Question: What was the flag carrier airline Air India and its subsidiary Air India Express Limited formed to oversee?

Context paragraphs:
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.

Air India Flight 182: Air India Flight 182 was an Air India flight operating on the Toronto–Montreal–London–Delhi route.  On 23 June 1985, the Boeing 747-237B serving the flight (c/n 21473/330, registration VT-EFO , "Emperor Kanishka") was destroyed by a bomb at an altitude of 31000 ft .  It crashed into the Atlantic Ocean while in Irish airspace.  It was the first bombing of a 747 jumbo jet.  A total of 329 people were killed, including 268 Canadian citizens, 27 British citizens and 24 Indian citizens.  The incident was the largest mass murder in Canadian history, and the deadliest incident in the history of Air India.  It was the deadliest terrorist attack involving an airplane until the September 11, 2001, attacks.  The bombing of Air India 182 occurred at the same time as the Narita Airport bombing.  Investigators believe that the two plots were linked, and that those responsible were aiming for a double bombing.  However, the bomb at Narita exploded before it could be loaded onto the plane.

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.

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.

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.

Air Corporations Employees Union: Air Corporations Employees Union (ACEU) is the largest union at India's flag carrier Air India, with a membership of 8000 out of 21,000 employees at the airline.  It represents non-technical staff.  The union opposes Government of India's plan to privatize the airline.  The union is led by JB Kadyan.

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

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).

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.

Haj subsidy: The Haj subsidy is a subsidy given to Indian Muslim Hajj pilgrims by the Government of India in form of discounted Air fares on Indian Government owned Air India.  The program has its origins in British colonial era.  In post-colonial era, the Government of India expanded the program in 1959 with the Hajj Act.  The subsidy initially applied to Indian Muslim pilgrims traveling for religious reasons to Saudi Arabia, Syria, Iraq, Iran and Jordan.  Haj subsidy started in 1954, as an idea initiated by the then government, with flights between Mumbai and Jeddah.  Additional flight legs were added over the years, and since 1984, all Haj traffic has been shared by Air India and Saudia, the national carriers of India and Saudi Arabia.The monopoly of these airlines has proven the most contentious point of the subsidy with some Muslims objecting to it by claiming that the real beneficiary is Air India as the subsidy is actually a discount on an overpriced air fare.  There have also been requests by Muslims to withdraw subsidy including some Muslim Parliament members as it is against Islam even it was beneficial.

Supporting paragraphs: Air India Limited Air India Express
Answer: merger of Air India and Indian