Question: Which airport will be decommissioned in the future, Montrose Regional Airport or Sloulin Field International Airport?

Context paragraphs:
Pensacola International Airport: Pensacola International Airport (IATA: PNS, ICAO: KPNS, FAA LID: PNS) , formerly Pensacola Gulf Coast Regional Airport and Pensacola Regional Airport (Hagler Field), is a public use airport three nautical miles (6 km) northeast of the central business district of Pensacola, in Escambia County, Florida, United States.  It is owned by the City of Pensacola.  Despite the name, this airport does not offer direct international flights.  This airport is one of the five major airports in North Florida, others being: Northwest Florida Beaches International Airport, Destin-Fort Walton Beach Airport Tallahassee International Airport, and Jacksonville International Airport.

Air Wisconsin: Air Wisconsin Airlines is a regional airline based at Appleton International Airport in the town of Greenville, Wisconsin, United States, near Appleton.  Air Wisconsin is the largest privately held regional airline in the United States.  It currently operates regional jet flights as American Eagle under contract to American Airlines via a code sharing agreement, serving cities in the U.S. and Canada with hubs at Boston Logan International Airport (BOS), Charlotte Douglas International Airport (CLT), Philadelphia International Airport (PHL) and Ronald Reagan Washington National Airport (DCA) .  Air Wisconsin previously operated United Express service on behalf of United Airlines followed by US Airways Express service on behalf of US Airways prior to becoming an American Eagle regional air carrier.  The company has announced it will once again partner with United Airlines as a United Express code sharing air carrier with primary hubs to be located at Chicago O'Hare International Airport (ORD) and Washington Dulles International Airport (IAD) beginning in September 2017 and will be "exclusively operating" as United Express by March 2018.

Raleigh Executive Jetport: Raleigh Exec: The Raleigh Executive Jetport @ Sanford-Lee County or Raleigh Exec Jetport at Sanford-Lee CountyFAA Airport Master Record for TTA (Form 5010 ) (ICAO: KTTA, FAA LID: TTA) is a public use airport located seven nautical miles (8 mi, 13 km) northeast of the central business district of Sanford, a city in Lee County, North Carolina, United States.  It is owned by the Sanford-Lee County Regional Airport Authority and was previously known as Sanford-Lee County Regional Airport.  This airport is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a "reliever airport" for Raleigh-Durham International Airport.

Montrose Regional Airport: Montrose Regional Airport (IATA: MTJ, ICAO: KMTJ, FAA LID: MTJ) is a non-towered public airport on the northwest side of Montrose, in zip code 81401 in southwestern Colorado.  Its two runways are at elevation 5,759 feet (1,755 m).  MTJ covers 966 acres (391 ha) of land.

Ta'if Regional Airport: Ta'if Regional Airport (IATA: TIF, ICAO: OETF) is an airport in Ta'if, Saudi Arabia.  Despite its name, it also offers many international flights as well.  The airport is located 30 km to the east of Taif and 70 km from Mecca.  The airport is considered important in Saudi aviation history as it witnessed the first landing of Ibn Saud's plane, founder of the Kingdom.  It was converted to a regional airport in 2009 when GACA allowed international airlines to operate at the airport as the city's population was increasing and to reduce pressure on the three main airports at the time.  Despite being named as a "Regional" airport, the airport actually has international flights destinations in half a dozen countries outside of Saudi Arabia.

Susquehanna Area Regional Airport Authority: The Susquehanna Area Regional Airport Authority (SARAA) is the governing authority of Harrisburg International Airport, Capital City Airport, Franklin County Regional Airport and Gettysburg Regional Airport in south-central Pennsylvania.  SARAA was incorporated on September 9, 1997, and officially took over control of HIA and CXY airports from the Commonwealth of Pennsylvania on January 1, 1998.

John Glenn Columbus International Airport: John Glenn Columbus International Airport (IATA: CMH, ICAO: KCMH, FAA LID: CMH) , is an international airport located 6 mi east of downtown Columbus, Ohio.  Formerly known as Port Columbus International Airport, it is managed by the Columbus Regional Airport Authority, which also oversees operations at Rickenbacker International Airport and Bolton Field.  The airport code 'CMH' stands for "Columbus Municipal Hangar," the original name for the airport.

Pokhara Airport: Pokhara Airport (IATA: PKR, ICAO: VNPK) , is a regional airport serving Pokhara in Nepal.  The airport was established on 4 July 1958 and is operated by the government (Civil Aviation Authority of Nepal).  It offers regular connections to Kathmandu and Jomsom; and seasonal connections to Manang.  Following a new agreement on air travel between India and Nepal, Pokhara is to be the site of Nepal's second international airport.  Construction started in the southeast of Pokhara in 2009 but is only progressing slowly.  In 2011 Buddha Air, a Nepali private airline, began international flights from Pokhara to Chaudhary Charan Singh International Airport in Lucknow, India, and has announced plans to fly to New Delhi's Indira Gandhi International Airport in the future.

Sloulin Field International Airport: Sloulin Field International Airport (IATA: ISN, ICAO: KISN, FAA LID: ISN) is an airport serving Williston, a city in North Dakota.  It is two miles north of downtown and is owned and operated by the City.  Built in 1947, the airport faces expansion constraints, design issues, and the need for runway refurbishment.  For these reasons, as well as the rise in air traffic amid the North Dakota oil boom, officials have decided to build Williston Basin International Airport.  This airport will replace Sloulin Field Airport, which will be decommissioned.

Williston Basin International Airport: Williston Basin International Airport (IATA: XWA) is an airport under construction near Williston, a city in the U.S. state of North Dakota.  It is located roughly 10 mi northwest of the city.  Williston Basin Airport will have two runways and a 110000 sqft terminal building.  It is being built to replace Sloulin Field International Airport, which currently serves Williston and has experienced difficulty dealing with the increase in air traffic to Williston amid the North Dakota oil boom.  The project is expected to be completed by late 2019.

Supporting paragraphs: Montrose Regional Airport Sloulin Field International Airport
Answer: Sloulin Field International Airport