Question: Houghton County Memorial Airport and Ketchikan International Airport are both located in what country?
Sentence (from "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.
Relevant evidence: Yes