Which air-line flies through Fort  Collins - Loveland Municipal Airport and employees 3,700 employees?
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.
Louisville International Airport Louisville International Airport (IATA: SDF, ICAO: KSDF, FAA LID: SDF) is a public and military use public airport centrally located in the city of Louisville in Jefferson County, Kentucky, United States. The airport is situated on approximately 1500 acre and has three runways. Its IATA airport code, SDF, is based on the airport's former name, Standiford Field. Although it currently does not have regularly-scheduled international passenger flights, it is a port of entry, as it handles numerous international cargo flights.