Question: Which airport flies to more countries, Provo Municipal Airport or Oakland International Airport?
Context: The Coliseum–Oakland International Airport line, also known informally as the BART to OAK line, is an automated guideway transit (AGT) system operated by Bay Area Rapid Transit (BART) between BART's Coliseum Station and Oakland International Airport.  The system opened for revenue service on November 22, 2014 and is integrated into BART’s fare system.  During planning and construction, it was known as the Oakland Airport Connector (OAC) project. Utah Lake State Park is a state park in west Provo, Utah, United States.  The park is located at the west end of Provo Center Street on the east shore of Utah Lake (the largest fresh water lake in the state) immediately northwest of the Provo Municipal Airport. Oakland International Airport station is a Bay Area Rapid Transit (BART) station on the Coliseum–Oakland International Airport line in Oakland, California, United States.  This station is on the system's Automated Guideway Transit (AGT) spur line, which carries passengers between Oakland International Airport (OAK) and Oakland Coliseum Station. Alpine Air Express is an American airline based in Provo, Utah, USA.  It operates scheduled air cargo services on over 20 routes throughout Colorado, Minnesota, Montana, Nebraska, North Dakota, South Dakota and Wyoming.  Its main base is the Provo Municipal Airport. Northern California TRACON (NCT) (Terminal Radar Approach Control), or NorCal TRACON for short, is an air traffic control facility that provides safety alerts, separation, and sequencing of air traffic arriving, departing, and transiting the airspace and airports in Northern California.  Located in Rancho Cordova near Sacramento, NCT controls airspace over 19000 square miles, and serves Reno International Airport, Sacramento International Airport, San Jose International Airport, Oakland International Airport, and San Francisco International Airport, plus 19 other smaller airports with air traffic control towers.  NCT is the 3rd busiest TRACON in America.  NorCal TRACON is the step between local control (in an airport's control tower) and Air Route Traffic Control Center (ARTCC), in this case, Oakland Center (ICAO code: ZOA).  San Francisco International Airport is the 2nd largest airport in California and the largest airport serving Northern California. Oakland International Airport (IATA: OAK, ICAO: KOAK, FAA LID: OAK) is an international airport in Oakland, California, United States.  It is located approximately 10 miles south of Downtown.  It is owned by the Port of Oakland.  The airport has passenger service to cities in the United States, Mexico, and Europe.  Cargo flights fly to cities in the United States, Canada, and Japan. Provo Municipal Airport (IATA: PVU, ICAO: KPVU, FAA LID: PVU) is a public airport two miles (3 km) west of Provo, in Utah County, Utah.  The airport hosts Allegiant Air flights to four airports, one in Arizona and three in California - Phoenix/Mesa Gateway Airport, Los Angeles International Airport, San Diego International Airport and Oakland International Airport.  It is the second busiest public airport in Utah by aircraft movements, with 172,000 aircraft operations in the year ending May 2007. Spanish Fork-Springville Airport (FAA LID:U77) is a general aviation airport located in north Spanish Fork, Utah, United States that serves both Spanish Fork and Springville.  It is located approximately 5 mi southeast of nearby Provo Municipal Airport. Charlotte Douglas International Airport (IATA: CLT, ICAO: KCLT, FAA LID: CLT) is a joint civil-military public international airport located in Charlotte, North Carolina, United States.  Established in 1935 as Charlotte Municipal Airport, in 1954 the airport was renamed Douglas Municipal Airport after former Charlotte mayor Ben Elbert Douglas, Sr. The airport gained its current name in 1982 and, as of September 2017, it is the second largest hub for American Airlines after Dallas/Fort Worth International Airport, with service to 161 domestic and international destinations.  As of 2016 it was the 5th busiest airport in the United States, ranked by passenger traffic and aircraft movements.  It was also the 7th business airport in the world ranked by aircraft movements Charlotte is the largest airport in the United States without any nonstop service to Asia.  The airport serves as a major gateway to the Caribbean Islands.  CLT covers 5,558 acres (2,249 ha) of land. The Doolittle maintenance and storage facility (also known as “The Wheelhouse”) is the operations management center for the Coliseum–Oakland International Airport line.  The building is used for storage and maintenance of the Cable Liner cars, and is also the powerhouse for the system’s 12 ft drive wheels, and is an essential part of Bay Area Rapid Transit's Coliseum–Oakland International Airport line.
Answer: Oakland International Airport