Question: McCarran International Airport and Niagara Falls International Airport, are located in which country?
Context: Niagara Falls International Airport (IATA: IAG, ICAO: KIAG, FAA LID: IAG) is 4 mi east of downtown Niagara Falls, in Niagara County, New York.  Owned and operated by the Niagara Frontier Transportation Authority, the airport is a joint civil-military airfield and shares its runways with the Niagara Falls Air Reserve Station.  A new terminal building opened in 2009. La Salle Senior High School was a multi-story Post-Modern era high school in Niagara Falls, New York built in 1956 and was run by the Niagara Falls City School District.  It was closed in 2000 and was subsequently merged with the "old" Niagara Falls High School to create the "new" Niagara Falls High School due to declining student enrollment associated with the declining population of Niagara Falls.  It is not to be confused with the former La Salle Junior High School, which is now the La Salle Preparatory School, also located in Niagara Falls.  The school was razed in 2001 to eventually make way for a Wal-Mart and the associated plaza buildings that include a Hobby Lobby and which also includes a Sam's Club, both located on what was once sports fields and viewing stands.  The school was located at the eastern front end of the large property and on prime real estate on Military Road almost directly opposite Wegmans, which is a busy shopping corridor which also includes the expanding Fashion Outlets Mall.  The school's nickname was the "Explorers", which is now being used by the preparatory school.  The site had once been farmers fields, with the Star-Lite Drive-In also nearby. New York State Route 182 (NY 182) is a 6.18 mi state highway in Niagara County, New York, in the United States.  It serves as a signed connection between the Whirlpool Rapids Bridge over the Niagara River and the Niagara Falls International Airport east of the city of Niagara Falls.  From the bridge, NY 182 runs across the city of Niagara Falls, following several local streets as it makes its way to an intersection with U.S. Route 62 (US 62) in Wheatfield.  The route was originally designated as New York State Route 18D in the early 1930s.  It gained its current designation on January 1, 1962. The Niagara Aerospace Museum is an aviation museum located in Niagara Falls, New York, in the old terminal building of the Niagara Falls International Airport.  The museum has been located in a number of places in the Niagara Falls/Buffalo area.  It had been located in the Niagara Office Building in downtown Niagara Falls and relocated in 2008 to the site of the then HSBC center on the waterfront in Buffalo, NY.  In the summer of 2013, the museum moved to its current location. The Niagara Aerospace Museum is an aviation museum located in Niagara Falls, New York, in the old terminal building of the Niagara Falls International Airport.  Formerly known as "Niagara Aerospace Museum", the museum was located in the Niagara Office Building in downtown Niagara Falls and relocated in 2008. The Niagara Frontier Transportation Authority (NFTA) is a public authority responsible for the public transportation oversight of Erie and Niagara counties in the state of New York.  The NFTA, as an authority, oversees a number of subsidiaries, including the NFTA Metro bus and rail system, the Buffalo-Niagara International Airport, the Niagara Falls International Airport and NFTA Small Boat Harbor.  The NFTA Metro bus and rail system is a multi-modal agency, utilizing various vehicle modes (diesel bus, diesel-hybrid bus, CNG bus, light rail and cut-away van), using the brand names: NFTA Metro Bus, NFTA Metro Rail, NFTA Metrolink and NFTA PAL (Para-transit Access Line).  In addition, the NFTA also owns and manages a number of properties, including the Buffalo Metropolitan Transportation Center in Downtown Buffalo (which serves as the agency's headquarters); the Niagara Falls Transportation Center on Factory Outlet Blvd. the Portage Road Transit Center in Niagara Falls; and a number of strategically located bus loops and transit centers in the Buffalo Niagara region.  Of note, many of the bus loops have been in continuous operation since the days of the International Railway Company, a predecessor to the NFTA.  Agency-wide, the NFTA employs 1,500 full-time and part-time employees.  There are three business centers that operate as the NFTA organization: Surface Transportation, which handles ground transportation throughout Erie and Niagara counties, Aviation, which handles air related business at the Buffalo-Niagara International Airport and Niagara Falls International Airport and Property Risk/Management, which operates the NFTA-Boat Harbor and handles other properties that are owned and/or operated by the NFTA. McCarran International Airport (IATA: LAS, ICAO: KLAS, FAA LID: LAS) is the primary commercial airport serving the Las Vegas Valley, a major metropolitan area in the U.S. state of Nevada.  It is located in Paradise, about 5 mi south of Downtown Las Vegas.  The airport is owned by Clark County and operated by the Clark County Department of Aviation.  It is named after the late U.S. Senator Pat McCarran, a member of the Democratic Party who contributed to the development of aviation both in Las Vegas and on a national scale. The Niagara Falls Memorial Arena was an arena located in Niagara Falls, Ontario, Canada.  It was built in 1950 and had a capacity of approximately 3,000.  The arena was home to various ice hockey teams in the past, including the Niagara Falls Thunder and the Niagara Falls Flyers.  It also served as the home of the Niagara Falls Canucks, a team in the Greater Ontario Junior B Hockey League.  The city has built the Gale Centre to replace the Memorial Arena.  The Gale Centre has a similar capacity in one of the four ice pads, with the other three having a modest capacity for recreational hockey and skating league purposes.  The Gale Centre has become a community center, of sorts, for ice-based activities with offices for figure skating and house-league hockey organizations.  The Niagara Falls Memorial Arena was demolished to make room for a parking lot upon completion of the new four-pad arena in 2009.  Updates on the project and the state of the old Memorial Arena can be found on the City of Niagara Falls website at www.niagarafalls.ca Niagara Falls International Airport Air Reserve Station (Niagara Falls Air Force Base c. 1955 -1971) is an Air Force Reserve Command military installation operationally-gained by the Air Mobility Command.  It is located adjacent to Niagara Falls International Airport, New York, 4.7 mi east-northeast of Niagara Falls, New York.  The station is the last "federal" USAF installation in the state, the other remaining USAF installations falling under the Air National Guard). The LaSalle Expressway (also known as the LaSalle Arterial) is a 2.62 mi limited-access highway in Niagara County, New York, in the United States.  It begins near the North Grand Island Bridge at an interchange with Interstate 190 (I-190) in Niagara Falls and ends just south of the Niagara Falls International Airport at Williams Road in Wheatfield.  The LaSalle Expressway is part of New York State Route 951A (NY 951A), an unsigned reference route; the other, 0.42 mi portion is located along Niagara Street between the Rainbow Bridge and Fifth Street in downtown Niagara Falls.  Most of this portion, which is not connected to the LaSalle Expressway, is also part of the signed NY 384.
Answer: U.S.