Question: St. Louis Lambert International Airport serves a hub for what American airline with its headquarters in Cocord, Missouri?

Documents:
source: Air Choice One
text: Air Choice One Multi-Aero, Inc., doing business as (d/b/a) Air Choice One, is an American airline with its headquarters in Concord, Missouri in Greater St. Louis. It acts as a regional airline offering commuter flights from Lambert-St. Louis International Airport, O'Hare International Airport and Minneapolis-St. Paul International Airport to smaller regional airports, subsidized under the Essential Air Service program.

source: St. Louis Lambert International Airport
text: St. Louis Lambert International Airport St. Louis Lambert International Airport (IATA: STL, ICAO: KSTL, FAA LID: STL) is an international airport serving Greater St. Louis, Missouri, United States. It is 14 mi northwest of downtown St. Louis in unincorporated St. Louis County between Berkeley and Bridgeton. Commonly named Lambert Field, it is the largest and busiest airport in Missouri with 270 daily departures to over 80 domestic and international locations. In 2016, 13.9 million passengers traveled through the airport. Lambert-St. Louis serves as a hub for Air Choice One and Cape Air. It is a focus city for Southwest Airlines, and was a former hub for Trans World Airlines and later for American Airlines.

source: Earth City, Missouri
text: Earth City, Missouri Earth City, Missouri, is an unincorporated community located in St. Louis County, along Interstate 70 near the Missouri River. It is bounded by the city of Bridgeton on the east and north, the city of Maryland Heights to the south, and the Missouri River to the west. It is also near Lambert International Airport. The town is notable as being home to the headquarters of the Save-A-Lot grocery chain and a major UPS shipping hub. It also has a large business park bounded by I-70 on the south, I-270 on the east, and Missouri Route 370 to the north. It is within three miles of three of the four major river-crossing bridges over the Missouri River.

source: Charles de Gaulle Airport
text: Charles de Gaulle Airport Paris Charles de Gaulle Airport (French: "Aéroport de Paris-Charles-de-Gaulle" , IATA: CDG, ICAO: LFPG ), also known as Roissy Airport (name of the local district), is the largest international airport in France. It is named after Charles de Gaulle (1890–1970), leader of the Free French Forces during the Second World War, founder of the French Fifth Republic and President of France from 1959 to 1969. Charles de Gaulle Airport is located within portions of several communes 25 km to the northeast of Paris. Charles de Gaulle Airport serves as the principal hub for Air France as well as a European hub for fellow SkyTeam alliance partner Delta Air Lines. Additionally, the airport serves as a focus city for low-cost carriers Vueling and Norwegian Air Shuttle.

source: Lambert St. Louis Airport Police
text: Lambert St. Louis Airport Police St. Louis Lambert Airport Police is responsible for all law enforcement and criminal investigations within St. Louis Lambert International Airport. The Airport Police is responsible for traffic control, criminal investigations, airport community oriented policing, airport security, rapid response counter terrorism, enforcement of local, state and federal laws at the airport and providing canine explosive detection support to the airport and surrounding communities.

source: Ozark Air Lines
text: Ozark Air Lines Ozark Air Lines operated in the United States from 1950 until 1986 when it was purchased by Trans World Airlines. A smaller airline with the same name (whose operating certificate was purchased by Great Plains Airlines) operated in 2000–2001. From 1950 until 1986 Ozark's headquarters was at Lambert–St. Louis International Airport in St. Louis County, Missouri.

source: St. Mary's Parish (Bridgeton, Missouri)
text: St. Mary's Parish (Bridgeton, Missouri) St. Mary's (of the Assumption) Parish in Bridgeton, Missouri was a Catholic parish in northwestern St. Louis County, located within the Archdiocese of St. Louis. Founded in 1851, the parish population expanded with suburban development at such a rate in the 1950s and 1960s that seven new parishes were created in the area. This parish was closed in 2001 due to planned expansion of St. Louis Lambert Airport. The parish church and related buildings were acquired by the airport and razed in 2004.

source: GoJet Airlines
text: GoJet Airlines GoJet Airlines LLC is a company headquartered in Bridgeton, Missouri, United States. Wholly owned by Trans States Holdings, it has 1670 employees. It operates commuter feeder services under the United Express and Delta Connection names. Go Jet Airlines has crew bases at Lambert-Saint Louis International Airport, O'Hare International Airport, Denver International Airport, and Raleigh-Durham International Airport. Flights are currently operated out of United's hubs at O'Hare International Airport and Denver International Airport, as well as Lambert-Saint Louis International Airport. GoJet's Delta Connection flights currently operate out of Lambert-Saint Louis International Airport , Detroit Metropolitan Airport and Raleigh-Durham International Airport. Its call sign "Lindbergh" is named after aviation pioneer Charles Lindbergh, who flew the "Spirit of St. Louis" solo across the Atlantic Ocean in 1927, the first person to do so.

source: Siegfried Reinhardt
text: Siegfried Reinhardt Siegfried Gerhard Reinhardt born July 31, 1925 in Eydkuhnen, Germany, died October 24, 1984 in St. Louis, Missouri was a prolific artist and teacher based for most of his career, 1955-1970 at Washington University in St. Louis, where he had taken his Bachelor of Arts degree in English Literature in 1950. He was also a prominent member of the St. Louis Artists Guild. He was the son of Otto Frederick and Minni (Kukat) Reinhardt, and emigrated with them in 1928 (naturalized in 1936). His best-known work is perhaps the series of murals he executed at Lambert International Airport illustrating the history of aviation. He was a pioneer in combining elements of realism and surrealism in a style known sometimes as superrealism. From 1949 to 1984 he worked with Emil Frei in the design and execution of stained glass windows, including the (1960) Easter Window in the Lutheran Church of the Resurrection, in Sunset Hills, Missouri, of which Reinhardt said:

source: Bridgeton, Missouri
text: Bridgeton, Missouri Bridgeton is a second-ring suburb of Greater St. Louis in northwestern St. Louis County, Missouri, United States. Bridgeton is located at the intersection of the St. Louis outer belt and I-70. Bridgeton serves as the primary transport hub within Greater St. Louis. The population at the 2010 census was 11,550. Portions of Lambert-St. Louis International Airport are within Bridgeton.

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Answer: Air Choice One