Question: Cut Bank Municipal Airport is in the Montana county that has a population of what as of 2010?

Context paragraphs:
Whetstone International Airport: 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 NM south of Del Bonita, Cardston County, Alberta.  The airport is owned by the U.S. state of Montana and is operated by the Montana Department of Transportation Aeronautics Division.  It is located 31 mi northwest of the city of Cut Bank, Montana.

Cut Bank Municipal Airport: Cut Bank Municipal Airport (IATA: CTB, ICAO: KCTB, FAA LID: CTB) is three miles southwest of Cut Bank, in Glacier County, Montana.  It is owned by Cut Bank and Glacier County.

Cut Bank station: Cut Bank station is a train station in Cut Bank, Montana.  It is served by Amtrak's "Empire Builder", and is an important regional railway freight yard for BNSF Railway, which operates several grain collection elevators in the yard.  The station site is owned by Amtrak, while the adjacent yard, trackage and signals are owned by BNSF Railway.  The station is less than a mile from Cut Bank Creek gorge, which gives the county seat, station, and yard their names.

Camp Disappointment: Camp Disappointment is the northernmost campsite of the Lewis and Clark expedition, on its return trip from the Pacific Northwest.  The site is on private land within the Blackfeet Indian Reservation in Glacier County, Montana.  It is located along the south bank of Cut Bank Creek and 12 mi northeast of Browning, Montana.  Glacier National Park can be seen in the distance.  The modern Canada–United States border with Montana is the 49th parallel north.

Glacier County, Montana: Glacier County is located in the U.S. state of Montana.  As of the 2010 census, the population was 13,399.  The county is located in northwestern Montana between the Great Plains and the Rocky Mountains, known to the Blackfeet as the "Backbone of the World".  The county is geographically and culturally diverse and includes the Blackfeet Native American Reservation, Glacier National Park, and Lewis and Clark National Forest.  The county is bordered by 75 miles of international boundary with two ports of entry (Piegan and Del Bonita) open year-round and one seasonal (Chief Mountain) international border crossing into Alberta, Canada.

Grundy Municipal Airport: Grundy Municipal Airport (ICAO: KGDY, FAA LID: GDY) is a public-use airport located three nautical miles (6 km) southwest of the central business district of Grundy, a town in Buchanan County, Virginia, United States.  It is publicly owned by the Town of Grundy and is operated by the Grundy Municipal Airport Commission.  Grundy Municipal is the only airport operating in Buchanan County.  Small personal and charter planes use the facility.  It is a 3 mi drive from Grundy, the county seat of Buchanan County.

Danielle Wineman: Danielle Wineman is an American actress and beauty pageant titleholder from Cut Bank, Montana, who was named Montana's Junior Miss 2010 and crowned Miss Montana 2015.  She competed for the Miss America 2016 title in September 2015.  Her younger sister, Alexis Wineman, was crowned Miss Montana 2012.

Cut Bank, Montana: Cut Bank is a city in and the county seat of Glacier County, Montana, United States, located just east of the "cut bank" (gorge) along Cut Bank Creek.  The population was 2,869 at the 2010 census, and the estimated population in 2015 was 3,002.

Cut Bank Creek: Cut Bank Creek is a tributary of the Marias River in the Missouri river basin watershed, approximately 75 mi (123 km) long, in northwestern Montana in the United States, which having deeply eroded steep cliff banks eponymously gives name to the cut bank formal terrain term of geological science.

Cut Bank Air Force Station: Cut Bank Air Force Station (Perm ID: P-24, SAGE ID: Z-24) is a closed United States Air Force General Surveillance Radar station.  It is located 30.4 mi northwest of Cut Bank, Montana.  It was closed in 1965.

Supporting paragraphs: Cut Bank Municipal Airport Glacier County, Montana
Answer: 13,399