Question: McCarran International Airport and Niagara Falls International Airport, are located in which country?

full_context: Document 1: Niagara Falls Air Reserve Station: 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).
Document 2: Reno–Tahoe International Airport: Reno–Tahoe International Airport (IATA: RNO, ICAO: KRNO, FAA LID: RNO) is a public and military use airport located three nautical miles (6 km) southeast of downtown Reno, in Washoe County, Nevada. It is the state's second busiest commercial airport after McCarran International Airport in Las Vegas. The Nevada Air National Guard has the 152nd Airlift Wing southwest of the airport's main terminal. It is named after Jesse L. Reno and Lake Tahoe.
Document 3: Niagara Aerospace Museum: 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.
Document 4: Ira G. Ross Aerospace Museum: 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.
Document 5: Greater Rochester International Airport: Greater Rochester International Airport (IATA: ROC, ICAO: KROC, FAA LID: ROC) is three miles (6 km) southwest of downtown Rochester, in Monroe County, New York. It is owned and operated by Monroe County. The largest airline that serves the airport is Delta Air Lines with 30% of passengers flying on Delta. The airport is home to the 642nd Aviation Support Battalion, part of the 42nd Infantry Division. It is the fourth-busiest airport in the state of New York and the second-busiest outside of the New York City metropolitan area.
Document 6: LaGuardia Airport: LaGuardia Airport (IATA: LGA, ICAO: KLGA, FAA LID: LGA) is an airport in the northern part of the New York City borough of Queens in the United States. It is on the waterfront of Flushing and Bowery Bays in East Elmhurst and borders the neighborhoods of Astoria and Jackson Heights. The airport is the third busiest airport serving New York City, and the twentieth busiest in the United States. LaGuardia Airport covers 680 acre .
Document 7: Pat McCarran: Patrick Anthony McCarran (August 8, 1876 – September 28, 1954) was a Democratic United States Senator from Nevada from 1933 until 1954. McCarran was born in Reno, Nevada, attended the Nevada State University, and was a farmer and rancher. In 1902 he won election to the Nevada Assembly, but in 1904 he was an unsuccessful candidate for the Nevada State Senate. He completed private law studies and was admitted to the bar in 1905; in 1906 he won election as Nye County's district attorney. He served a two-year term, after which he relocated to Reno.
Document 8: Las Vegas Convention and Visitors Authority: The Las Vegas Convention and Visitors Authority (LVCVA) is the official destination marketing organization for Southern Nevada. The LVCVA is a public-private partnership that owns and operates the Las Vegas Convention Center (LVCC), Cashman Center, and Cashman Field and is responsible for the advertising campaigns for the Clark County, Nevada, area.
Document 9: Henderson Executive Airport: Henderson Executive Airport (IATA: HSH, ICAO: KHND, FAA LID: HND) is a public airport located 11 NM south of the central business district of Las Vegas, in Clark County, Nevada, United States. The airport is owned by Clark County and operated by the Clark County Department of Aviation. According to the FAA's National Plan of Integrated Airport Systems for 2009-2013, it is categorized as a "reliever airport". It was originally known as Sky Harbor Airport, but was renamed in 1996 when it was purchased by Clark County to be used as a reliever airport for McCarran International Airport.
Document 10: Niagara Frontier Transportation Authority: 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.
Document 11: McCarran International Airport: 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.
Document 12: Las Vegas–Paradise, NV MSA: The Las Vegas–Paradise, NV MSA, also known as the Las Vegas–Henderson–Paradise, NV Metropolitan Statistical Area (2013), is in the southern part of the U.S. state of Nevada, coextensive since 2003 with Clark County, Nevada. A central part of the metropolitan area is the Las Vegas Valley, a 600 sqmi basin that includes the metropolitan area's largest city, Las Vegas as well as the other primary city, Paradise, Nevada. The area contains the largest concentration of people in the state. Cities in the metropolitan area include Las Vegas, Henderson, North Las Vegas, and Boulder City. The metropolitan area is one of the top tourist destinations in the world, drawing over 40 million international and domestic visitors in 2013 with a GMP of US$103.3 billion.
Document 13: LaGuardia Airport: LaGuardia Airport (IATA: LGA, ICAO: KLGA, FAA LID: LGA) is an airport in the northern part of the New York City borough of Queens in the United States. It is on the waterfront of Flushing and Bowery Bays in East Elmhurst and borders the neighborhoods of Astoria and Jackson Heights. The airport is the third busiest airport serving New York City, and the twentieth busiest in the United States. LaGuardia Airport covers 680 acre .
Document 14: Patrick, Nevada: Patrick is an unincorporated community in Storey County which was the site of a historic ranch. The founder of the ranch, Patrick McCarran, arrived in Nevada in 1858 as a member of the United States Army under General Winfield Scott Hancock. In 1862 McCarran claimed 2600 acre of land that would become McCarran Ranch and the unincorporated community of Patrick. Patrick's son, Pat McCarran, became Nevada's first native born U.S. Senator and a staunch anti communist. Patrick Nevada is also the owner of four of the cattle in the ranch.
Document 15: Niagara Falls International Airport: 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.
ground_truth: U.S.