Blue Grass Airport (IATA: LEX, ICAO: KLEX, FAA LID: LEX) is a public airport in Fayette County, Kentucky, 4 miles west of downtown Lexington.
 Located among world-renowned horse farms and situated directly across from Keeneland Race Course, Blue Grass Airport is the primary airport serving central and eastern Kentucky.
 More than 1.2 million passengers depart or arrive annually at Blue Grass Airport.
 In 2016, the airport served 1,245,251 passengers via four major airline carriers: Allegiant, American Airlines, Delta Air Lines and United Airlines.
Comair Flight 5191, marketed as Delta Connection Flight 5191, was a scheduled United States (US) domestic passenger flight from Lexington, Kentucky, to Atlanta, Georgia, operated on behalf of Delta Connection by Comair.
 On the morning of August 27, 2006, at around 06:07 EDT, the Bombardier Canadair Regional Jet 100ER that was being used for the flight crashed while attempting to take off from Blue Grass Airport in Fayette County, Kentucky, 4 mi west of the central business district of the City of Lexington.
Sioux Gateway Airport (IATA: SUX, ICAO: KSUX, FAA LID: SUX) , also known as Colonel Bud Day Field, is a public and military use airport in Woodbury County, Iowa, United States.
 It is located six nautical miles (7 mi, 11 km) south of the central business district of Sioux City, just west of Sergeant Bluff.
 On May 25, 2002 the airport was named in honor of United States Air Force Colonel George Everette "Bud" Day, a Sioux City, Iowa native who is the only person ever awarded both the Medal of Honor and the Air Force Cross.
Sioux Falls Regional Airport (IATA: FSD, ICAO: KFSD, FAA LID: FSD) , also known as Joe Foss Field, is a public and military use airport owned by the Sioux Falls Regional Airport Authority and located three nautical miles (6 km) northwest of the central business district of Sioux Falls, a city in Minnehaha County, South Dakota, United States.
 Named in honor of aviator Joe Foss, it serves the greater Sioux Falls area, as well as communities throughout eastern South Dakota, southwestern Minnesota and northwestern Iowa.
Sioux City Air National Guard Base is a United States Air Force base, located at Sioux Gateway Airport It is located 7.2 mi south-southeast of Sioux City, Iowa.
 On 25 May 2002, the airport was named "Colonel Bud Day Field" in honor of United States Air Force Colonel George Everette "Bud" Day, a Sioux City, Iowa native and is the only person ever awarded both the Medal of Honor and the Air Force Cross.
Phoenix–Mesa Gateway Airport (IATA: AZA, ICAO: KIWA, FAA LID: IWA) , formerly Williams Gateway Airport (1994–2008) and Williams Air Force Base (1941–1993), is in the southeastern area of Mesa, Arizona, and 20 mi southeast of Phoenix, in Maricopa County, Arizona.
 The airport is owned and operated by the Phoenix–Mesa Gateway Airport Authority, and is a reliever airport for Phoenix Sky Harbor International Airport.
 It is a base for Allegiant Air.
 The airport authority is governed by a six-member board: the mayors and tribal governor of the town of Gilbert, city of Mesa, town of Queen Creek, Gila River Indian Community, city of Phoenix, and the city of Apache Junction.
The Aviation Museum of Kentucky is an aviation museum located at the Blue Grass Airport in Lexington, Kentucky.
 Incorporated in April 1995, and opened to the public in August of the same year, it includes 12000 sqft of exhibit space, a library, and an aircraft restoration and repair shop.
 The museum is the home of the "Kentucky Aviation Hall of Fame".
Ozark Air Lines Flight 650 was a regularly scheduled flight from Sioux Gateway Airport in Sioux City, Iowa, to Sioux Falls Regional Airport in Sioux Falls, South Dakota.
 While landing on runway 3 in a snow storm on December 20, 1983, it struck a snow plow on the runway.
 The impact ripped the right wing from the plane destroying the snow plow and killing its driver.
 The leaking fuel from the wing briefly created a fireball that engulfed the airplane.
 The plane spun through 180° before coming to rest off the runway to the left of the center line.
 Passenger evacuation was initiated through the front two doors.
 No passengers were injured in the evacuation but two flight attendants suffered minor injuries.
Blue Grass is an unincorporated community on VA 642 at its junction with VA 640 in Highland County, Virginia, United States.
 Blue Grass lies along the South Branch Potomac River and is located approximately 6.1 mi north of Monterey, Virginia.
 It was previously known as Crabbottom and Hulls Store before the Board on Geographic Names officially decided upon Blue Grass in 1950.
 Near Blue Grass is the Devils Backbone rock formation.
 Blue Grass has a post office with ZIP code 24413.
 The Hollywood silent film classic "Tol'able David" was filmed in Blue Grass during 1921.
Jim Shumate (October 21, 1921 – October 10, 2013) was a fiddler that played with Bill Monroe and the Blue Grass Boys from 1943–1945.
 Shumate's main influences were Fiddlin' Arthur Smith, Curly Fox, and his uncle who played the fiddle while he was growing up.
 Shumate joined the band after Bill Monroe heard him playing on the radio station WHKY from downtown Hickory, North Carolina, and asked him to join the Blue Grass Boys.
 Howdy Forrester, who was Bill Monroe's fiddle player at the time, gave his notice and was going into the Navy.
 At age 20, Shumate became the fiddler for the Blue Grass Boys, and he sang bass on gospel songs.
 During this time, the Blue Grass Boys were also a baseball team, so they would arrive early to towns they were playing at and challenge the local baseball team.
 Unfortunately, there were no recordings made while Shumate was in the Blue Grass Boys.

Question: Which airport was used for both public and military use, Sioux Gateway Airport or Blue Grass Airport?
Answer: Sioux Gateway Airport