Question: Which airport's main aircraft and maintainence base was a public airport six miles west of Downtown Tampa?

Context paragraphs:
Casa Grande Municipal Airport: Casa Grande Municipal Airport (IATA: CGZ, ICAO: KCGZ, FAA LID: CGZ) is a city-owned public airport six miles north of Casa Grande, in Pinal County, Arizona.  The FAA's National Plan of Integrated Airport Systems for 2009–2013 categorizes it as a "general aviation" facility.  The airport is not served by an airline.

Telluride Regional Airport: Telluride Regional Airport (IATA: TEX, ICAO: KTEX, FAA LID: TEX) is a public airport six miles west of Telluride, in San Miguel County, Colorado.  It is owned by the Telluride Regional Airport Authority.  At an elevation of 9,078 feet (2767 m) above sea level, it once again became the highest commercial airport in North America with scheduled passenger flights when Great Lakes Airlines resumed scheduled passenger service in December 2016; the airline had previously left the airport in 2014.

Dallas Executive Airport: Dallas Executive Airport (IATA: RBD, ICAO: KRBD, FAA LID: RBD) , formerly Redbird Airport, is a public airport six miles (10 km) southwest of Downtown Dallas, in Dallas County, Texas.  The airport is used for general aviation and is a reliever airport for Dallas Love Field.  In 2013, the Commemorative Air Force announced that they would build a "National Airbase" at Executive which would include their headquarters and main museum, both of which would be moved from Midland.

Donaldson Center Airport: Donaldson Center Airport (IATA: GDC, ICAO: KGYH, FAA LID: GYH) is a public airport six miles (10 km) south of the central business district of Greenville, a city in Greenville County, South Carolina, United States.  It located at the Donaldson Center Industrial Air Park and is owned by the City and County of Greenville.

Tampa International Airport: Tampa International Airport (IATA: TPA, ICAO: KTPA, FAA LID: TPA) is a public airport six miles west of Downtown Tampa, in Hillsborough County, Florida, United States.  This airport is publicly owned by Hillsborough County Aviation Authority (HCAA).  It has been praised for its architecture and "Landside/Airside" design of a central terminal ("landside") connected by people movers to satellite air terminals and gates ("airsides"), a pioneering concept when designed in the late 1960s.  The airport was called Drew Field Municipal Airport until 1952.

Rick Husband Amarillo International Airport: Rick Husband Amarillo International Airport (IATA: AMA, ICAO: KAMA, FAA LID: AMA) is a public airport six miles (10 km) east of downtown Amarillo, in Potter and Randall Counties, Texas, United States.  The airport was renamed in 2003 after NASA astronaut and Amarillo native Rick Husband, who died in the Space Shuttle "Columbia" disaster in February of that year.

Tampa Riverwalk: Tampa Riverwalk is a phased open space and pedestrian trail development along the Hillsborough River in Tampa, Florida.  The downtown Tampa portion travels alongside the Tampa Arts District and includes Curtis Hixon Park, The Macdill Park, the Tampa Museum of Art, Glazer Children's Museum, Rivergate Tower and adjacent atrium containing the Florida Museum of Photographic Arts.  The Riverwalk extends along most of the downtown Tampa waterfront from the Channelside District west to the Tampa Convention Center and north up the east bank of the Hillsborough River to Water Works Park in Tampa Heights, forming a continuous path of 2.4 miles connecting parks and attractions to several large hotels.

Ohio State University Airport: Ohio State University Airport (IATA: OSU, ICAO: KOSU, FAA LID: OSU) is a public airport six miles (10 km) northwest of downtown Columbus, in Franklin County, Ohio, United States.  It is owned and operated by The Ohio State University in Columbus, not to be confused with Ohio University in Athens, which owns the Ohio University Airport (IATA: ATO, ICAO: KUNI, FAA LID: UNI) .  It is also known as the OSU Don Scott Airport, named after Donald E. Scott, an OSU alumnus who died during his training as a pilot in the United Kingdom during World War II.

North American Airlines: North American Airlines, Inc., was an American airline with its headquarters at the HLH Building in Peachtree City, Georgia in Greater Atlanta, USA.  Prior to May 2008, it operated scheduled international services from the USA to Africa and Guyana.  Later it operated domestic and international charter services and wet lease services.  Its main aircraft and maintenance base was Tampa International Airport.

Terre Haute Regional Airport: Terre Haute Regional Airport (IATA: HUF, ICAO: KHUF, FAA LID: HUF) is a civil-military public airport six miles east of Terre Haute, in Vigo County, Indiana.  The FAA's National Plan of Integrated Airport Systems for 2011–2015 categorized it as a "general aviation" facility.  It is also the location of Hulman Field Air National Guard Base of the Indiana Air National Guard

Supporting paragraphs: North American Airlines Tampa International Airport
Answer: North American Airlines, Inc.