Question: Scoot Tigerair Pte Ltd. is a Singaporean low-cost long-haul airline owned by an airline that has a hub in which airport ?

Context paragraphs:
Singapore Airlines: Singapore Airlines Limited (SIA; ) is the flag carrier of Singapore with its hub at Singapore Changi Airport.  The airline uses the Singapore Girl as its central figure in its corporate branding.

Scoot: Scoot Tigerair Pte Ltd. (operating as Scoot) is a Singaporean low-cost long-haul airline owned by Singapore Airlines through its subsidiary Budget Aviation Holdings.  It launched flights in June 2012 on medium and long-haul routes from Singapore, predominantly to China and India.  Initially, Scoot's fleet consisted of Boeing 777 aircraft obtained from Singapore Airlines.  The airline began to transition its fleet to Boeing 787 Dreamliner aircraft from 2015.  On 25 July 2017, Tigerair was officially merged into Scoot using Tigerair's air operator's certificate (AOC) but retaining the 'Scoot' brand.  With the change of AOC, the airline's IATA code was changed from TZ to TR, previously used by Tigerair.  Its head office is at Singapore Changi Airport.

Tigerair Mandala: Tigerair Mandala ("formerly Mandala Airlines") was a low-cost airline headquartered in Jakarta, Indonesia and is an associate company of the Singapore-based Tigerair Group.  The former full service airline repositioned itself as a budget airline/low-cost carrier (LCC) following a year-long grounding in 2011 caused by debt woes.  Mandala resumed operations in April 2012 following an injection of fresh capital by Indonesian conglomerate Saratoga Investment Corp which took over 51% of the airline, with partner Tigerair taking up 33.3% and the rest by creditors.

Jetstar Asia Airways: Jetstar Asia Airways Pte Ltd (operating as Jetstar Asia) is a low-cost airline based in Singapore.  It is one of the Asian offshoots of parent Jetstar Airways, the low-cost subsidiary airline of Australia's Qantas airline.  It operates services to regional destinations in Southeast Asia to countries such as Myanmar, Cambodia, Malaysia, Philippines, Thailand and Vietnam.  It also flies to regional routes in East Asia such as Japan, Taiwan and Hong Kong.  It is the main feeder airline for its parent company Jetstar Airways for budget passengers flying to Australia.  Its sister airlines include Jetstar in New Zealand, Jetstar Pacific and Jetstar Japan.

Phua Chu Kang Pte Ltd: Phua Chu Kang Pte Ltd, also known as PCK Pte Ltd or Phua Chu Kang for short (鬼馬家族 in Chinese), was a Singaporean sitcom on MediaCorp TV Channel 5.  The show debuted in Singapore in 1997.  A sequel, "Phua Chu Kang Sdn Bhd" debuted on NTV7 on 25 March 2009 and aired in Singapore's MediaCorp TV Channel 5 on 6 October 2009.

Tigerair Australia: Tiger Airways Australia Pty Ltd, operating as Tigerair Australia, is an Australian low-cost airline.  It commenced services in the Australian domestic airline market on 23 November 2007 as Tiger Airways Australia.  It is a fully owned subsidiary of Virgin Australia Holdings.  The airline is based in Melbourne, Victoria, with its main base at Melbourne Airport.  The Civil Aviation Safety Authority of Australia (CASA) grounded the airline in 2011; as a result operating bases at Adelaide and Avalon were shut down and it initially only operated out of its Melbourne base after returning to the air.  On 7 March 2012, Tigerair announced the reopening of a second base at Sydney Airport.

Value Alliance: Value Alliance is an airline alliance formed in May 2016.  It is the world's second alliance (after the U-FLY Alliance) to consist only of low-cost carriers (LCCs).  However, it is the first pan-regional LCC alliance.  It comprises seven Asia-Pacific airlines: Cebu Pacific, Jeju Air, Nok Air, NokScoot, Scoot, Tigerair Australia and Vanilla Air, along with Tigerair who merged with Scoot under the Scoot brand.

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.

Tigerair: Tiger Airways Singapore Pte Ltd, operating as Tigerair, was a budget airline headquartered in Singapore.  It operated services to regional destinations in Southeast Asia, Bangladesh, China and India from its main base at Singapore Changi Airport.  It was founded as an independent airline in 2003, and was listed on the Singapore Stock Exchange under the Tiger Airways Holdings name in 2010.  In October 2014, parent company Tiger Airways Holdings became a subsidiary of the SIA Group, who took a 56% ownership stake.

Scoot destinations: Scoot is a Singaporean low-cost long-haul airline owned by Singapore Airlines.  It launched flights in 2012 on medium and long-haul routes from Singapore.

Supporting paragraphs: Scoot Singapore Airlines
Answer: Singapore Changi Airport