Question: what does Lawton–Fort Sill Regional Airport and Erie International Airport have in common?

Context paragraphs:
Erie International Airport: Erie International Airport Tom Ridge Field (IATA: ERI, ICAO: KERI, FAA LID: ERI) is a public airport five miles (8 km) southwest of Erie, in Erie County.  Airline service at Erie faces stiff competition from the Pittsburgh, Cleveland and Buffalo airports, all within two hours of Erie by car.  In 2004 Erie was the third fastest growing airport in the United States, and the fastest growing airport in Pennsylvania.  It is also 128 mi from Pittsburgh, 111 mi from the Canada–US border, 95 mi from Cleveland, Ohio and 105 mi from Buffalo, New York.

History of Lawton, Oklahoma: The History of Lawton, Oklahoma refers to the history of the southwestern Oklahoma city of Lawton, Oklahoma.  Lawton's history starts with opening of American Indian reservation lands in the early 1900s and has seen population and economic growth throughout the 20th Century due to its proximity with Fort Sill.

Camp Doniphan, Oklahoma: Camp Doniphan was a military base adjacent to Fort Sill, just outside Lawton, in Comanche County, Oklahoma, that was activated for use in World War I for artillery training.

Mount Scott (Oklahoma): Mount Scott is a prominent mountain just to the northwest of Lawton, Oklahoma rising to a height of 2464 ft .  It is located in the Wichita Mountains near Fort Sill Military Reservation and lies in the Wichita Mountains National Wildlife Refuge (WMWR).  The US Fish and Wildlife Service is responsible for the maintenance of the area.  Visitors can reach the summit by car or bicycle via a three-mile paved road.  Hiking is allowed, although there are no formal trails and the paved road is open to pedestrians.  Mount Scott is also popular for its numerous rock climbing areas.  The peak was named in honor of General Winfield Scott.

Elgin, Oklahoma: Elgin is a city in Comanche County, Oklahoma, United States.  The population was 2,156 at the 2010 census, a 78 percent increase from 1,210 at the 2000 census.  It is included in the Lawton, Oklahoma Metropolitan Statistical Area.  It is the site of Fort Sill National Cemetery.

Lawton High School (Oklahoma): Lawton High School (LHS) was the first high school built in Lawton, Oklahoma.  Lawton High is located at 601 Northwest Fort Sill Boulevard in Lawton, Oklahoma.  The school was originally housed in a building on 800 Southwest 'C' Avenue, which later came to be the Central Junior High building until the junior high was also moved to 1201 Northwest Fort Sill Boulevard.  Old Lawton High School on C Avenue is listed on the National Register of Historic Places.

Lawton–Fort Sill Regional Airport: Lawton–Fort Sill Regional Airport (IATA: LAW, ICAO: KLAW, FAA LID: LAW) is a city owned airport two miles south of Lawton, in Comanche County, Oklahoma.  It is used for military aviation from nearby Fort Sill and Sheppard Air Force Base and is served by American Eagle.  Allegiant Air runs occasional charters to various destinations in the western United States.

Elmer Thomas Lake: Elmer Thomas Lake is a lake in Comanche County in the state of Oklahoma in the United States.  It is located on the boundary between the Wichita Mountain Wildlife Refuge and Fort Sill military base.  The lake is named for an Oklahoma lawyer and politician, Elmer Thomas (1876-1965), who lived in Lawton and represented Oklahoma's 6th Congressional District in the U. S. House of Representatives from 1922 until 1926, then was elected as U.S. Senator, where he served until 1950.

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.

Medicine Park, Oklahoma: Medicine Park is a town in Comanche County, Oklahoma, United States, situated in the Wichita Mountains near the entrance to the 60000 acre Wichita Mountain Wildlife Refuge.  Medicine Park has a long history as a vintage cobblestone resort town.  Medicine Park is located near the city of Lawton and Fort Sill.  It is an exurb, part of the Lawton Metropolitan Statistical Area.  Many of the original structures are constructed of naturally formed cobblestones—these red granite cobblestones are unique to the Wichita Mountains.  The population was 382 at the 2010 census.

Supporting paragraphs: Lawton–Fort Sill Regional Airport Erie International Airport
Answer: United States