Question: Are Pierre Regional Airport and Four Corners Regional Airport both city owned?

Context paragraphs:
Huron Regional Airport: Huron Regional Airport (IATA: HON, ICAO: KHON, FAA LID: HON) is a city owned public airport in Huron, within Beadle County, South Dakota.  It recently had scheduled passenger flights operated by a commuter air carrier, Great Lakes Airlines, with service to Denver subsidized by the Essential Air Service (EAS) program; however, Great Lakes no longer serves Huron.  The airport serves as a backup site for Sioux Falls Regional Airport.

Montana Highway 84: Highway 84 in the U.S. State of Montana is a route running easterly from the small community of Norris to an intersection with U.S. Route 191 at Four Corners, a distance of approximately 29 mi .  The highway's eastern terminus, about 7 mi west of Bozeman, is a location known locally as "Four Corners."  From Four Corners, US 191 runs east to Bozeman, and south to West Yellowstone; Highway 84 travels west to Norris; and Montana Highway 85 runs north to Belgrade.

Four Corners Regional Airport: Four Corners Regional Airport (IATA: FMN, ICAO: KFMN, FAA LID: FMN) is in San Juan County, New Mexico, a mile northwest of Farmington, which owns it.  Great Lakes Airlines is the only airline to service the airport, with up to three daily departures to Denver International Airport.

Enid Woodring Regional Airport: Enid Woodring Regional Airport (IATA: WDG, ICAO: KWDG, FAA LID: WDG) is a city owned, public use airport located four nautical miles (5 mi, 7 km) southeast of the central business district of Enid, a city in Garfield County, Oklahoma, United States.  It is also referred to as Woodring Airport and was formerly known as Enid Woodring Municipal Airport.  This airport is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a "general aviation" facility.  It is mostly used for military training flights based at Vance Air Force Base.

Pierre Regional Airport: Pierre Regional Airport (IATA: PIR, ICAO: KPIR, FAA LID: PIR) is a city owned, public airport three miles east of Pierre, in Hughes County, South Dakota, United States.  The airport was served by two airlines until January 31, 2012 when Delta Air Lines regional affiliate Delta Connection ceased all service.  Great Lakes Airlines now flies both east and west via interline agreements with Delta Air Lines, Frontier Airlines and United Airlines.

Four Corners, Maryland: Four Corners is an unincoporated neighborhood located in Montgomery County, Maryland.  Many residents of the Four Corners neighborhood, consider Four Corners to be a part of Silver Spring.  The U.S. Census Bureau defines Four Corners as a distinct census-designated place.  Prior to the 2010 U.S. Census, it was defined as a part of the Silver Spring CDP.

Four Corners: The Four Corners is a region of the United States consisting of the southwestern corner of Colorado, southeastern corner of Utah, northeastern corner of Arizona, and northwestern corner of New Mexico.  The Four Corners area is named after the quadripoint at the intersection of approximately 37° north latitude with 109° 03' west longitude, where the boundaries of the four states meet, and are marked by the Four Corners Monument.  It is the only location in the United States where four states meet.  Most of the Four Corners region belongs to semi-autonomous Native American nations, the largest of which is the Navajo Nation, followed by Hopi, Ute, and Zuni tribal reserves and nations.  The Four Corners region is part of a larger region known as the Colorado Plateau and is mostly rural, rugged, and arid.  In addition to the monument, commonly visited areas within Four Corners include Monument Valley, Mesa Verde National Park, Chaco Canyon, and Canyon de Chelly National Monument.  The most populous city in the Four Corners region is Farmington, New Mexico, followed by Durango, Colorado.

Manassas Regional Airport: Manassas Regional Airport (IATA: KHEF, ICAO: HEF) , also known as Harry P. Davis Field, is a city-owned public-use airport located four nautical miles (7 km) southwest of the central business district of Manassas, in a section of Manassas that was carved out of Prince William County specifically for the purpose of containing the airport.  The largest regional airport in the state of Virginia, Manassas Regional Airport is located 30 miles from Washington, D.C.

W. K. Kellogg Airport: W. K. Kellogg Airport (IATA: BTL, ICAO: KBTL, FAA LID: BTL) is a city owned, public use, joint civil-military airport located three nautical miles (6 km) west of the central business district of Battle Creek, a city in Calhoun County, Michigan, United States.  The airport is accessible by road from Helmer Road, and is located near I-94.  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.  It is also known as W. K. Kellogg Regional Airport.

Elizabeth City Regional Airport: Elizabeth City Regional Airport (IATA: ECG, ICAO: KECG, FAA LID: ECG) is a joint civil-military public and military use airport located three nautical miles (6 km) southeast of the central business district of Elizabeth City, in Pasquotank County, North Carolina, United States.  The airport, on the shore of the Pasquotank River, is also known as Elizabeth City-Pasquotank County Regional Airport or ECG Regional Airport.  It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a "general aviation" facility.

Supporting paragraphs: Pierre Regional Airport Four Corners Regional Airport
Answer: yes