Question: What low-cost airline runs occasional charter to various places in the western United States?

Context paragraphs:
Lawton–Fort Sill Regional Airport: Lawton–Fort Sill Regional Airport (IATA: LAW, ICAO: KLAW, FAA LID: LAW) is a city owned airport two miles south of Lawton, in Comanche County, Oklahoma.  It is used for military aviation from nearby Fort Sill and Sheppard Air Force Base and is served by American Eagle.  Allegiant Air runs occasional charters to various destinations in the western United States.

Homicidal ideation: Homicidal ideation is a common medical term for thoughts about homicide.  There is a range of homicidal thoughts which spans from vague ideas of revenge to detailed and fully formulated plans without the act itself.  Many people who have homicidal ideation do not commit homicide.  50-91% of people surveyed on university grounds in various places in the United States admit to having had a homicidal fantasy.  Homicidal ideation is common, accounting for 10-17% of patient presentations to psychiatric facilities in the United States.

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.

Low-cost carrier: A low-cost carrier or low-cost airline (also known as "no-frills", "discount" or "budget" carrier or airline, or "LCC") is an airline that generally has lower fares and fewer comforts.  To make up for revenue lost in decreased ticket prices, the airline may charge for extras such as food, priority boarding, seat allocating, and baggage.  As of July 2014, the world's largest low-cost carrier is Southwest Airlines, which operates in the United States and some surrounding areas.

Orca Airways: Orca Airways is a scheduled and charter airline based in Vancouver, British Columbia, Canada.  The airline provides scheduled commercial service, cargo and charter services, and aircraft management in Canada and the western United States.  Orca operates a fleet of 16 Piper PA-31-350 Chieftains, 3 Fairchild SA227s and a Beechcraft Model 100 King Air.  The company operates from the south terminal at Vancouver International Airport.

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.

Canada 3000: Canada 3000 Inc. was a Canadian discount charter airline offering domestic and international flights.  It was the largest charter airline in the world at the time of its operation, with over 90 destinations worldwide, although it changed to scheduled service in 2000 after the Canadian Airlines and Air Canada merger.  Canada 3000 competed with Air Canada, WestJet, and fellow charter airline Air Transat.  In November 2001, the airline went out of business after a sharp decline in revenues following the September 11, 2001, terrorist attacks in the United States.  There have been several attempts to restart the airline since then.  The airline was headquartered in Etobicoke in the west-end of Toronto, Ontario.

Pacific Express: Pacific Express was an all-jet airline in the western United States from 1982 to early 1984, based in Chico, California.  The airline later marketed itself as Pan Am Pacific Express, thus reflecting a marketing agreement between Pan American World Airways (Pan Am) and the carrier for connecting passenger traffic feed at the Los Angeles and San Francisco airports.  At one point, Pacific Express served 22 destinations in the western United States.  It was a subsidiary of WestAir Jet Inc.

ALMA de México: Aerolíneas Mesoamericanas, S.A. de C.V., operating as ALMA de Mexico, was a low-cost airline based in Guadalajara, Mexico.  It suspended all service on November 7, 2008.  The airline once operated flights to more than 18 domestic destinations, with plans for international service to the United States.  Its main base was Don Miguel Hidalgo y Costilla International Airport, Guadalajara.

Cuisine of the Western United States: The Western United States has its own cuisine, distinct in various ways from that of the rest of the country.  Those states west of Texas, Kansas, Missouri, and Nebraska would be considered part of this area, as would, in some cases, western parts of adjoining states.  The locavore movement is increasingly influential, as is the concept of sustainability.  The influence of the Native American cultures of each area, but especially in the Northwest and in Navajo country, is important in the cuisine picture of the Western United States.

Supporting paragraphs: Lawton–Fort Sill Regional Airport Allegiant Air
Answer: Allegiant Air