Are Range Regional Airport and Buffalo Niagara International Airport both located in the US?
yes
Title: Range Regional Airport
Passage: Range Regional Airport (IATA: HIB, ICAO: KHIB, FAA LID: HIB) is a public use airport located four nautical miles (5 mi, 7 km) southeast of the central business district of Hibbing, in Saint Louis County, Minnesota, United States.  It was formerly known as Chisholm-Hibbing Airport or Chisholm-Hibbing Municipal Airport.  The airport is mostly used for general aviation but is also served by one commercial and one charter airline.  Scheduled passenger service is subsidized by the Essential Air Service program.
Title: American Airlines Flight 96
Passage: American Airlines Flight 96 was a regular McDonnell Douglas DC-10-10 flight operated by American Airlines.  On June 12, 1972, the aircraft's rear cargo door blew off while flying over Windsor, Ontario, en route from Detroit Metropolitan Wayne County Airport to Buffalo Niagara International Airport; it is thus sometimes referred to as the Windsor incident.
Title: Buffalo Niagara International Airport
Passage: Buffalo Niagara International Airport (IATA: BUF, ICAO: KBUF, FAA LID: BUF) is in Cheektowaga, New York, United States, named after the Buffalo–Niagara Falls metropolitan area.  The airport serves Buffalo, New York and the southern Golden Horseshoe region of Ontario, Canada.  It is the third-busiest airport in the state of New York and the busiest outside of the New York City metropolitan area.  It is about 11 mi east of Downtown Buffalo and 110 mi southeast of Toronto.
Buffalo Niagara International Airport Range Regional Airport