Question: Which airport is a regional cargo hub for UPS Airlines, Columbia Metropolitan Airport or Hilo International Airport or both?

Context paragraphs:
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.

UPS Airlines: UPS Airlines is an American cargo airline owned by United Parcel Service Inc. ().  The company is headquartered in Louisville, Kentucky.  Its international all-points air hub, Worldport, is based at Louisville International Airport.  The pilots are represented by the Independent Pilots Association.

Philadelphia International Airport: Philadelphia International Airport (IATA: PHL, ICAO: KPHL, FAA LID: PHL) , often referred to just by its IATA code PHL, is a major airport in Philadelphia, Pennsylvania, United States, and is the largest airport in the Delaware Valley region and in the state.  The airport is a major international hub for American Airlines and a regional cargo hub for UPS Airlines.  Philadelphia International Airport is also a focus city for ultra low cost airline Frontier Airlines.  The airport has service to destinations in the United States, Canada, the Caribbean, Latin America, Europe, and the Middle East.  Most of the airport property is located in Philadelphia proper.  The international terminal and the western end of the airfield are located in Tinicum Township, Delaware County.  PHL covers 2,302 acres (932 ha).

Merlin Airways: Merlin Airways is an American airline based in Billings, Montana, USA.  It operates freight services under contract to FedEx Express and UPS Airlines.  The airline previously conducted FAR Part 121 passenger operations in Alaska and Texas as well as providing charter service for gambling junkets.  As of 1999 the company has ceased passenger operations to focus on the main aspect of their business which is providing freight services to FedEx and UPS.  Its headquarters is Billings, Montana, with hubs at Miami International Airport and at Luis Muñoz Marín International Airport, San Juan, Puerto Rico.

Hilo International Airport: Hilo International Airport (IATA: ITO, ICAO: PHTO, FAA LID: ITO) , formerly General Lyman Field, is owned and operated by the Hawaiʻ i state Department of Transportation.  Located in Hilo, Hawaiʻ i County, the airport encompasses 1391 acre and is one of two major airports on Hawaiʻ i Island and one of five major airports in the state.  Hilo International Airport serves most of East Hawaiʻ i, including the districts of Hilo and Puna, as well as portions of the districts of Hāmākua and Kaʻ ū.  Most flights to the airport are from Honolulu International Airport.  These flights are predominantly operated by Hawaiian Airlines and Aloha Air Cargo.

UPS Airlines Flight 1354: UPS Airlines Flight 1354 was a scheduled cargo flight from Louisville International Airport to Birmingham–Shuttlesworth International Airport.  On August 14, 2013, the aircraft flying this route, a UPS Airlines Airbus A300-600F, crashed and burst into flames short of the runway on approach to Birmingham–Shuttlesworth International Airport in the US state of Alabama.  Both pilots were pronounced dead at the scene of the crash.  They were the only people aboard the aircraft.

Shenzhen Bao'an International Airport: Shenzhen Bao'an International Airport (; formerly Shenzhen Huangtian Airport) (IATA: SZX, ICAO: ZGSZ) is located near Huangtian and Fuyong villages in Bao'an District, Shenzhen, Guangdong, China, 32 km northwest of the city center.  It is a hub for Shenzhen Airlines and Shenzhen Donghai Airlines and for cargo airline SF Airlines, and a focus city for China Southern Airlines and Hainan Airlines.  The airport also serves as an Asian-Pacific cargo hub for UPS Airlines.  The airport is undergoing major expansion with a second runway completed and opened in 2011 and a new terminal which opened in 2013.

Columbia Metropolitan Airport: Columbia Metropolitan Airport (IATA: CAE, ICAO: KCAE, FAA LID: CAE) is the main commercial airport for Columbia and the Midlands region of South Carolina.  The airport is five miles (8 km) southwest of Columbia, in Lexington County.  The airport is a regional cargo hub for UPS Airlines.

Bishop International Airport: Bishop International Airport (IATA: FNT, ICAO: KFNT, FAA LID: FNT) is a commercial and general aviation airport located in Flint, Michigan.  It is named after banker and General Motors board member Arthur Giles Bishop (April 12, 1851 – January 22, 1944), who donated 220 acres of his farmland for the airport in 1928.  The third busiest airport in Michigan, it surpassed competitor MBS International Airport in terms of airline operations in 2002.  In 2007, 1,071,238 passengers used Bishop International Airport; in 2011, 938,914 passengers used the airport.  It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021, in which it is categorized as a small hub primary commercial service facility.  The airport is currently served by several passenger airlines: Allegiant Air, Southwest Airlines and Delta Air Lines operate mainline service out of the airport, as well as affiliates of Delta Connection, United Express and American Eagle.  Additionally, FedEx Express and a FedEx Feeder affiliate operate cargo services out of the airport.  Accompanying the airlines is fixed-base operator Av Flight that handles both general aviation and airline operations and the flight school American Wings Aviation.  Bishop International Airport is in southwestern Flint, and is surrounded by Flint Township to the north, east and west; and Mundy Township to the south.

UPS Airlines Flight 6: UPS Airlines Flight 6 was a cargo flight operated by UPS Airlines.  On September 3, 2010, a Boeing 747-400F flying the route between Dubai International Airport and Cologne Bonn Airport developed an in-flight fire, with the fumes and subsequent crash resulting in the death of the two crew members.  The aircraft had departed Dubai International earlier, but returned after reporting smoke in the cockpit.  It was the first fatal air crash for UPS Airlines.  The crash caused an examination of safety procedures protecting airliners from cockpit smoke.

Supporting paragraphs: Columbia Metropolitan Airport Hilo International Airport
Answer: Columbia Metropolitan Airport