Question: Phoenix–Mesa Gateway Airport is a base for a low-cost airline that has how many employees?

Context paragraphs:
America West Airlines: America West Airlines was a U.S. airline headquartered in Tempe, Arizona.  Their main hub was at Sky Harbor Airport in Phoenix, Arizona, with a secondary hub at Las Vegas McCarran International Airport in Las Vegas, Nevada.  The airline became part of the US Airways Group after it acquired the larger airline in 2005 and adopted the US Airways brand name.  America West was the second largest low-cost carrier in the U.S. after Southwest Airlines and served approximately 100 destinations in the US, Canada, and Mexico.  Service to Europe was provided through codeshare partners.  In March 2005, the airline operated a fleet of 132 aircraft, with a single maintenance base at Sky Harbor Airport in Phoenix.  Regional jet and/or turboprop feeder flights were operated on a code sharing basis by Mesa Airlines and Chautauqua Airlines as America West Express.

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.

Norwegian Air Shuttle destinations: Norwegian Air Shuttle is a low-cost airline operating from Norway, Sweden, Denmark, Finland, Spain and the United Kingdom.  As of December 2012, it operates to 87 airports in 25 countries across three continents, from its operating bases.  Norwegian was founded in 1993 as a regional airline to operate routes for Braathens SAFE in Western Norway.  It became a domestic, main-haul low-cost carrier from 1 September 2002, when it took into use Boeing 737-300.  In 2006, Norwegian Air Shuttle established its first non-Norwegian base at Warsaw Frédéric Chopin Airport in Poland.  A year later, Norwegian bought the Swedish low-cost carrier FlyNordic, which was merged into Norwegian a year later.

Allegiant Air: Allegiant Air is an American low-cost airline that operates scheduled and charter flights.  It is wholly owned by Allegiant Travel Company (NASDAQ: ALGT ), a publicly traded company with 3,700 employees and over $2.6 billion USD market capitalization.  The corporate headquarters are in Summerlin, Nevada, a suburb of Las Vegas.

Phoenix–Mesa Gateway Airport: Phoenix–Mesa Gateway Airport (IATA: AZA, ICAO: KIWA, FAA LID: IWA) , formerly Williams Gateway Airport (1994–2008) and Williams Air Force Base (1941–1993), is in the southeastern area of Mesa, Arizona, and 20 mi southeast of Phoenix, in Maricopa County, Arizona.  The airport is owned and operated by the Phoenix–Mesa Gateway Airport Authority, and is a reliever airport for Phoenix Sky Harbor International Airport.  It is a base for Allegiant Air.  The airport authority is governed by a six-member board: the mayors and tribal governor of the town of Gilbert, city of Mesa, town of Queen Creek, Gila River Indian Community, city of Phoenix, and the city of Apache Junction.

Philippines AirAsia: Philippines AirAsia, Inc. (formerly Zest Airways, Inc. dba AirAsia Zest), is a low-cost airline based at Ninoy Aquino International Airport in Metro Manila in the Philippines.  The airline is the Philippine affiliate of AirAsia, a low-cost airline based in Malaysia.  The airline started as a joint venture between three Filipino investors and AirAsia Investments Ltd., a subsidiary of AirAsia Berhad.

Centralwings: Centralwings was a charter airline based in Warsaw, Poland.  The airline operated as a low-cost airline and then became a charter-only operation in October 2008.  It was a subsidiary of LOT Polish Airlines, operating international services in Europe, using Boeing 737 aircraft.  Its main base was Warsaw Frederic Chopin Airport, with hubs at Gdańsk Lech Wałęsa Airport and John Paul II International Airport Kraków-Balice.  On 26 March 2009 the board of LOT Polish Airlines decided to close Centralwings with no information about what was to happen to its employees.

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.

Provo Municipal Airport: Provo Municipal Airport (IATA: PVU, ICAO: KPVU, FAA LID: PVU) is a public airport two miles (3 km) west of Provo, in Utah County, Utah.  The airport hosts Allegiant Air flights to four airports, one in Arizona and three in California - Phoenix/Mesa Gateway Airport, Los Angeles International Airport, San Diego International Airport and Oakland International Airport.  It is the second busiest public airport in Utah by aircraft movements, with 172,000 aircraft operations in the year ending May 2007.

Go! (airline): Go!  (styled as go!) , based in Honolulu was a regional brand of Phoenix, Arizona-based Mesa Airlines.  Go!  operated inter-island services within Hawaii.  Its main base was Honolulu International Airport.  It was a division within the Mesa Airlines subsidiary of Mesa Air Group and its flights were operated by Mesa Airlines.  The airline ceased operations in Hawaii on April 1, 2014.

Supporting paragraphs: Phoenix–Mesa Gateway Airport Allegiant Air
Answer: 3,700