Question: how is Northwest Arkansas Regional Airport and Mammoth Yosemite Airport related?
Context: Northwest Arkansas Regional Airport (IATA: XNA, ICAO: KXNA, FAA LID: XNA) is a public use airport in Northwest Arkansas, United States.  It is 15 NM northwest of the city of Fayetteville and 10 NM northwest of the city of Springdale.  The airport, located in Highfill, Arkansas, is also near the cities of Bentonville, Rogers, and Springdale.  It is commonly referred to by its IATA code, which is incorporated in the airport's logo as "Fly XNA". The Northwest Arkansas Razorback Regional Greenway (usually shortened to Razorback Regional Greenway or just Greenway in Northwest Arkansas) is a 36 mi primarily off-road shared-use trail in Northwest Arkansas.  Dedicated on May 2, 2015, the Greenway connects Walker Park in Fayetteville, Arkansas to Lake Bella Vista in Bella Vista, Arkansas, while also serving schools, businesses and other cultural amenities along the route. Mammoth Yosemite Airport (IATA: MMH, ICAO: KMMH, FAA LID: MMH) is a town-owned public airport seven miles east of Mammoth Lakes, in Mono County, California.  Also known as Mammoth Lakes Airport or Mammoth-June Lake Airport, it is mainly used for general aviation, but has scheduled passenger flights operated by two airlines, one of which only serves the airport on a seasonal basis during the winter sports season. The Northwest Arkansas Times (ISSN 1066-3355  ) is a daily newspaper in Fayetteville, Arkansas owned by Northwest Arkansas Newspapers and has circulation of 17,807 copies.  It was formerly owned by the Thomson Corporation, who sold it to Hollinger in 1995; Hollinger sold it on to Community Publishers Inc., owned by Jim Walton, in 1999.  In 2005, WEHCO Media bought "The Northwest Arkansas Times" and the "Benton County Daily Record" from CPI.  In 2009, WEHCO and Stephens Media merged their northwest Arkansas papers into a joint venture, Northwest Arkansas Newspapers.  On Jan. 5, 2015, Northwest Arkansas Newspapers consolidated their four daily newspapers, "Northwest Arkansas Times", "Benton County Record", "Springdale Morning News", and "Rogers Morning News", creating the "Northwest Arkansas Democrat Gazette". The Osage Mills Dam is a historic dam in rural Benton County, Arkansas.  It impounds Osage Creek, just upstream of Mill Dam Road (County Road 47), between Rogers and the Northwest Arkansas Regional Airport.  The dam was built c. 1890 out of coursed stone with a rusticated face.  It was built to provide power to a grist mill that served the area, of which only a small portion of the millrace remains visible.  The dam is the only known structure of its type in the county. Highfill is a town in Benton County, Arkansas, United States.  The population was 583 at the 2010 census.  It is home to the Northwest Arkansas Regional Airport, which serves all of Northwest Arkansas, including the Bentonville–Fayetteville–Siloam Springs–Springdale–Rogers, AR-MO-OK Metropolitan Statistical Area. CenturyTel of Northwest Arkansas, LLC is a telephone operating of CenturyLink providing local telephone services to northwest Arkansas, Missouri, and Oklahoma.  The company was founded in 1999 when CenturyTel purchased access lines in Arkansas from GTE which had been a part of GTE Southwest. South Arkansas Regional Airport at Goodwin Field (IATA: ELD, ICAO: KELD, FAA LID: ELD) is a city-owned public-use airport located eight nautical miles (9 mi, 15 km) west of the central business district of the City of El Dorado, in Union County, Arkansas, United States.  It is mostly used for general aviation.  It was served by SeaPort Airlines, a service which was subsidized by the federal government's Essential Air Service program at a cost of $1,977,153 (per year).  SeaPort Airlines ceased operations on September 20, 2016. KQSM-FM (92.1 FM, "92.1 The Ticket") is a popular US radio station broadcasting a Sports Talk format in SEC country.  Licensed to Fayetteville, Arkansas, it serves the Fayetteville, Springdale, Bentonville and Rogers (Northwest Arkansas) market area.  The station is currently owned by Cumulus Media.  It has been the #1 rated sports radio station in Northwest Arkansas in every ratings book (Arbitron and Nielsen) in total listeners and average share since its inception in June 2009. The state of Arkansas is served by three telephone area codes: 479, 501, and 870.  In 1947, when the North American Numbering Plan was first implemented, the entire state of Arkansas was assigned the area code 501.  With Arkansas being relatively sparsely populated, this arrangement worked well until 1997, when the phone numbers in area code 501 were in danger of being used up.  Area code 870 was created in April 1997 to serve the most rural parts of the state (originally specifically not Little Rock metro, Fort Smith or Northwest Arkansas).  In January 2002, area code 479 broke from 501, giving Fort Smith and Northwest Arkansas their own calling code.
Answer: public