Question: What country does Yuma International Airport and John F. Kennedy International Airport have in common?
Context: Yuma International Airport (IATA: YUM, ICAO: KNYL, FAA LID: NYL) is a joint use airport with civilian and military flight activity operated in conjunction with the U.S. Marine Corps via the Marine Corps Air Station Yuma.  The airfield is located three nautical miles (6 km) south of the central business district of Yuma, a city in Yuma County, Arizona, United States.  It is mostly used for military aviation, but is also served by one commercial airline and one aeromedical Medevac company as well as being used for general aviation activities. EgyptAir Flight 990 (MS990/MSR990) was a regularly scheduled flight from Los Angeles International Airport, United States, to Cairo International Airport, Egypt, with a stop at John F. Kennedy International Airport, New York City.  On October 31, 1999, the Boeing 767 operating the route crashed into the Atlantic Ocean about 60 mi south of Nantucket Island, Massachusetts, killing all 217 people on board.  The official probable cause of the crash was deliberate action by the relief first officer. Trans World Airlines Flight 358 (TWA Flight 358) was a domestic flight traveling from Chicago's O'Hare International Airport to New York City's John F. Kennedy International Airport.  On June 11, 1971, a ticketless man named Gregory White boarded the Boeing 727 aircraft using force and demanded a machine gun, $75,000, and to be flown to North Vietnam.  After murdering a passenger, White was soon apprehended at the John F. Kennedy International Airport by FBI agents, wounded, and arrested.  It was the first attempted hijacking in the United States that resulted in a passenger fatality. The transportation system of New York City is a network of complex infrastructural systems.  New York City, being the most populous city in the United States, has a transportation system which includes one of the largest subway systems in the world; the world's first mechanically ventilated vehicular tunnel; and an aerial tramway.  New York City's airport system, which includes John F. Kennedy International Airport, LaGuardia Airport, Newark Liberty International Airport (located in New Jersey), Stewart Airport and a few smaller facilities, is one of the largest in the world.  New York City is also home to an extensive bus system in each of the five boroughs, and numerous taxis throughout the city. John F. Kennedy International Airport (IATA: JFK, ICAO: KJFK, FAA LID: JFK) , often referred to as Kennedy Airport, or simply JFK, is the primary international airport serving New York City.  It is the busiest international air passenger gateway into North America, the fifth busiest airport in the United States and the busiest airport in the New York City airport system, handling just under 59 million passengers in 2016.  Over ninety airlines operate out of the airport, with non-stop or direct flights to destinations in all six inhabited continents. Pan Am Flight 73, a Pan American World Airways Boeing 747-121, was hijacked on September 5, 1986, while on the ground at Karachi, Pakistan, by four armed Palestinian men of the Abu Nidal Organization.  The aircraft, with 360 passengers on board, had just arrived from Sahar International Airport in Mumbai, India, and was preparing to depart Jinnah International Airport in Karachi for Frankfurt Airport in Frankfurt am Main, West Germany, ultimately continuing on to John F. Kennedy International Airport in New York City, United States.  A June 2001 grand jury charged that the militants were planning to use the hijacked plane to pick up Palestinian prisoners in both Cyprus and Israel. The 1965 Carmel mid-air collision occurred on December 4, 1965, when Eastern Air Lines Flight 853 (N6218C), a Lockheed Super Constellation en route from Boston Logan International Airport to Newark International Airport, collided in mid-air with Trans World Airlines Flight 42 (N748TW), a Boeing 707-131B en route from San Francisco International Airport to John F. Kennedy International Airport, over Carmel, New York, United States. Southwest Airlines Flight 812 (SWA812, WN812) was a passenger flight which suffered rapid depressurization at 34400 ft near Yuma, Arizona, leading to an emergency landing at Yuma International Airport, on April 1, 2011.  The incident caused minor injuries to two of the 123 aboard.  The aircraft involved, a Boeing 737–300, was operating Southwest Airlines' domestic scheduled service from Phoenix Sky Harbor International Airport, Phoenix, Arizona, to Sacramento International Airport, Sacramento, California. International air travel from the United Kingdom refers to the commercial carriage of passengers between the UK and the rest of the world.  In 2008, London Heathrow Airport which is also the busiest international airport on Earth handled 67,054,745 passengers which is more than the total population of the United Kingdom.  The 20 busiest airports in the UK handled close to 230 million passengers in 2008 (185 million of whom were international passengers).  The geographical size of the UK means that many flights that would be considered domestic in for example the United States are actually international (i.e. the distance from Heathrow to Charles de Gaulle Airport is roughly the same as the distance between John F. Kennedy International Airport and Washington Dulles International Airport).  The London airports, Heathrow, Gatwick and Stansted alongside Manchester Airport rank amongst the world's busiest airports by international passenger traffic.  According to 2008 statistics the best served nations by direct flights from the UK were France, Italy, Spain, the United States and Germany with 50, 34, 33, 31 and 29 respectively.  Overall Spain was the nation that saw the most passengers arrive from the UK in 2008, with a total of 34,557,729 (almost double the number that flew to the United States) Polar Air Cargo, Inc., a subsidiary of Atlas Air Worldwide Holdings, is an American cargo airline based in Purchase, New York.  It operates scheduled all-cargo services to North America, Asia, Europe, and the Middle East.  Its main base is Anchorage International Airport, Alaska, with hubs at Los Angeles International Airport, Cincinnati/Northern Kentucky International Airport, John F. Kennedy International Airport and Incheon International Airport near Seoul, South Korea.
Answer: United States