Frank Whetstone International Airport or Del Bonita/Whetstone International Airport (FAA LID: H28, TC LID: CEQ4) is a public use airport at the Canada–US border, in Port of Del Bonita, Glacier County, Montana,[2] 2 nautical miles (4 km; 2 mi) south of Del Bonita, Cardston County, Alberta.

[1] It is located 31 miles (50 km) northwest of the city of Cut Bank, Montana.

[1] The airport has a runway located on the border, with aircraft tie down areas in Canada and in the United States.

The airport covers an area of 14 acres (6 ha) at an elevation of 4,336 ft (1,322 m)[2][3] above mean sea level.

[2][3] For the 12-month period ending April 27, 2016, the airport had 110 aircraft operations: 73% general aviation and 27% military.