Question: Which air-line flies through Fort  Collins - Loveland Municipal Airport and employees 3,700 employees? 

Context paragraphs:
Fort Collins (song): "Fort Collins" is a song by American hip hop recording artist Hopsin, featuring Funk Volume label mate, Dizzy Wright.  The song was released on September 3, 2015 and serves as the fourth and final single from Hopsin's fourth studio album, "Pound Syndrome".  The song is named after Fort Collins, Colorado, which was the scene where Hopsin suffered a mental breakdown before he was due to perform on stage, causing him to leave prematurely.  "Fort Collins" is also the final single Hopsin released on Funk Volume before his departure from the label in early 2016.

Fort Collins Municipal Railway: The Fort Collins Municipal Railway operated streetcars in Fort Collins, Colorado, from 1919 until 1951.  Since 1984, a section of one of the former routes has been in operation as a seasonal heritage streetcar service, under the same name, running primarily on Spring and Summer weekends.  The heritage service is operated by volunteers from the Fort Collins Municipal Railway Society (FCMRS).  The streetcar in use on the heritage line, Birney "Safety" Streetcar No. 21, is listed on the National Register of Historic Places.

Granby Dam: Granby Dam (National ID # CO01656) is an earthfill dam that dams the Colorado River 5.5 mi northeast of Granby, Colorado in Grand County, Colorado.  This 298 ft -tall dam was constructed between 1941 and 1950 and has a drainage area of 311 sqmi .  The Granby Dam's reservoir is known as Lake Granby, the largest reservoir component of the Colorado-Big Thompson Project.  Lake Granby stores Colorado River water that is diverted under the Continental Divide for agriculture and municipal use within north-eastern Colorado including the cities of Boulder, Fort Collins, Loveland, and Greeley.  In addition to the waters of the Colorado, water from Willow Creek just below the dam is pumped up 175 ft to Lake Granby.  Water from Lake Granby is pumped 125 ft higher by the Granby Pumping Plant to the Granby Pump Canal, which extents 1.8 mi to Shadow Mountain Lake, from which water is diverted through the Alva B. Adams Tunnel to the East Slope.

The Gardens on Spring Creek: The Gardens on Spring Creek is an 18 acre (72,843 m²) botanical garden located on the Spring Creek corridor in Fort Collins, Colorado.  The entrance is at 2145 Centre Avenue in Fort Collins.  The gardens are owned by the city of Fort Collins.

Fort Collins Museum of Discovery: The Fort Collins Museum of Discovery (formerly the Fort Collins Museum & Discovery Science Center) is a partnership of two educational institutions that merged in 2008 to create a combined science and cultural resource for Fort Collins and northern Colorado.

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.

Thompson School District R2-J: The Thompson R2-J School District is located in Loveland, Colorado and covers schools in Loveland, Berthoud, Masonville, Drake, and the southern part of Fort Collins.  It is the 16th largest school district in Colorado, serving more than 16,000 students within 30 schools.

Loveland Chamber of Commerce: The Loveland Chamber of Commerce is a membership-based organization of more than 700 companies and 16,000 individuals in northern Colorado and serves as the driving force for business in Loveland, promoting business and community prosperity.  The Chamber focuses on four pillars to accelerate and sustains businesses which are connections, visibility, education and advocacy.  The Loveland Chamber is one of the founding members of the Northern Colorado Legislative Alliance, along with the Fort Collins and Greeley chambers of commerce.

Fort Collins–Loveland Municipal Airport: Northern Colorado Regional Airport (IATA: FNL, ICAO: KFNL, FAA LID: FNL) is a public use airport located nine nautical miles (10 mi, 17 km) southeast of the central business district of Fort Collins and northeast of Loveland, both cities in Larimer County, Colorado, United States.  It is mostly used for general aviation; scheduled passenger jet service operated by Allegiant Air nonstop to Las Vegas was discontinued in October 2012.  The airport supports commercial flights non-stop to Chicago Rockford International Airport by Elite Airways.

Joseph Mason (settler): Joseph Mason, known as the "Father of Fort Collins, Colorado", was an early white homesteader in Larimer County, Colorado in the 1860s.  Mason settled a large tract of land along the Cache la Poudre River in present-day north Fort Collins, and he played in an instrumental role in persuading the United States Army to found Camp Collins along the river adjacent to his property in 1864.  He became prominent in politics and business in Fort Collins after the founding of the town in 1867, and served in several official posts, including Sheriff of Larimer County.

Supporting paragraphs: Fort Collins–Loveland Municipal Airport Allegiant Air
Answer: 3,700 employees