Question: Houghton County Memorial Airport and Ketchikan International Airport are both located in what country?

Context paragraphs:
Houghton County Memorial Airport: Houghton County Memorial Airport (IATA: CMX, ICAO: KCMX, FAA LID: CMX) is a county owned public use airport located four nautical miles (5 mi, 7 km) southwest of the central business district of Calumet, a village in Houghton County, Michigan, United States.  The airport is situated in the unincorporated community of Oneco in Franklin Township, near the village of Calumet on the Keweenaw Peninsula in northwest of the Upper Peninsula of Michigan.  A limited scheduled commercial service is available, subsidized by the Essential Air Service program.  In addition, Royale Air Service provides a seaplane service to Isle Royale National Park depending on traveler demand.

Ketchikan International Airport: Ketchikan International Airport (IATA: KTN, ICAO: PAKT, FAA LID: KTN) is a state-owned, public-use airport located one nautical mile (2 km) west of the central business district of Ketchikan, a city in Ketchikan Gateway Borough in the U.S. state of Alaska which has no direct road access to the outside world nor to the airport.  The airport is located on Gravina Island, just west of Ketchikan on the other side of the Tongass Narrows.  Passengers must take a seven-minute ferry ride across the water to get to the airport from the town.

Ketchikan Harbor Seaplane Base: Ketchikan Harbor Seaplane Base (IATA: WFB, FAA LID: 5KE) is a privately owned, public use seaplane base located at the harbor of Ketchikan, a city in the Ketchikan Gateway Borough of the U.S. state of Alaska.  It is located near the Ketchikan International Airport, which also has its own seaplane landing area.  Prior to the opening of the Ketchikan International Airport in 1973, scheduled passenger seaplane service was operated with amphibian aircraft between the seaplane base and the Annette Island Airport located approximately 20 miles south as this land plane airfield previously served as the primary airport for Ketchikan with scheduled airline flights being operated by Pan American World Airways, Pacific Northern Airlines and Western Airlines into Annette Island over the years.

Taquan Air: Taquan Air is the operating name for Venture Travel, LLC, an American regional airline headquartered in Ketchikan, a city in the southeastern portion of the U.S. state of Alaska.  It operates domestic scheduled passenger and charter services.  Its base is Ketchikan Harbor Seaplane Base, which shares the same harbor and airspace as Ketchikan International Airport.  As per the United States Department of Transportation in a report dated August 2, 2010, Taquan Air is a "U.S. Certificated Air Carrier", and is 1 of 125 such carriers in the US.

Raleigh County Memorial Airport: Raleigh County Memorial Airport (IATA: BKW, ICAO: KBKW, FAA LID: BKW) is a public use airport located three nautical miles (6 km) east of the central business district of Beckley, a city in Raleigh County, West Virginia, United States.  It is owned by the Raleigh County Airport Authority.  The airport is used for general aviation, but is also served by one commercial airline with scheduled passenger service subsidized by the Essential Air Service program.

Gravina Island Highway: The Gravina Island Highway is a 3.2 mi gravel highway located on Gravina Island, in the Ketchikan Gateway Borough of the U.S. state of Alaska.  The highway was part of a project that would connect Gravina Island, specifically, the Ketchikan International Airport, to the city of Ketchikan.  The Gravina Island Bridge, which would have connected the highway to Ketchikan was cancelled, but the highway was built.  Because the highway does not pass by or connect to any village or other place of importance, it has been nicknamed the "Highway to Nowhere".

Gravina Island Bridge: The Gravina Island Bridge, commonly referred to as the "Bridge to Nowhere", was a proposed bridge to replace the ferry that currently connects the town of Ketchikan, Alaska, United States, with Gravina Island, an island that contains the Ketchikan International Airport as well as 50 residents.  The bridge was projected to cost $398 million.  Members of the Alaskan congressional delegation, particularly Representative Don Young and Senator Ted Stevens, were the bridge's biggest advocates in Congress, and helped push for federal funding.  The project encountered fierce opposition outside Alaska as a symbol of pork barrel spending and is labeled as one of the more prominent "bridges to nowhere".  As a result, Congress removed the federal earmark for the bridge in 2005.

Warren County Memorial Airport: Warren County Memorial Airport (IATA: RNC, ICAO: KRNC, FAA LID: RNC) is a county-owned public-use airport in Warren County, Tennessee, United States.  It is located three nautical miles (6 km) west of the central business district of McMinnville, Tennessee.  This airport is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a "general aviation" facility.

ViaAir: ViaAir is an airline that offers scheduled Essential Air Service from Raleigh County Memorial Airport in Beckley, West Virginia, Parkersburg/Marietta in Parkersburg, West Virginia, Lewisburg (WV) in Greenbrier County, West Virginia near Lewisburg, West Virginia and White Sulphur Springs, West Virginia, and Clarksburg in Clarksburg, West Virginia near Fairmont, West Virginia to Charlotte Douglas International Airport in Charlotte, North Carolina.  ViaAir also offers Essential Air Service to Clarksburg from Baltimore.

Sheboygan County Memorial Airport: Sheboygan County Memorial Airport (IATA: SBM, ICAO: KSBM, FAA LID: SBM) is a county owned public use non-towered airport located in the Town of Sheboygan Falls, three nautical miles (6 km) northwest of the City of Sheboygan, in Sheboygan County, Wisconsin, United States.  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 regional general aviation facility.  Sheboygan's National Weather Service observation station is based at the airport.

Supporting paragraphs: Houghton County Memorial Airport Ketchikan International Airport
Answer: United States