The Battle Creek River (simply Battle Creek on federal maps) is a river in the U.S. state of Michigan.
 It is a tributary of the Kalamazoo River, joining it at Battle Creek, Michigan.
 The Kalamazoo River empties into Lake Michigan.
United p.s. is a premium service offered by United Airlines on flights between Newark Liberty International Airport and Los Angeles International Airport and San Francisco International Airport, as well as between Boston Logan International Airport and San Francisco International Airport.
 The fleet consists of specially configured Boeing 757-200 aircraft with three classes of service: United Business, United Economy Plus, and United Economy.
 Each class of service includes certain amenities not offered on regular flights.
Logan International Airport (IATA: BOS, ICAO: KBOS, FAA LID: BOS) , officially known as General Edward Lawrence Logan International Airport, is an international airport located in the East Boston neighborhood of Boston, Massachusetts, United States (and partly in the town of Winthrop, Massachusetts).
 It covers 2384 acre , has six runways and four passenger terminals, and employs an estimated 16,000 people.
 It is the largest airport in the New England region and 17th-busiest airport in the United States, with 33.5 million total passengers in 2015.
 It is named after General Edward Lawrence Logan.
 In 2016, Massport reported an 8.5% increase in passenger traffic comparing 2015 to 2016, giving the airport a total of about 36.3 million passengers.
The Michigan Battle Cats was a minor league baseball team which began playing in the Midwest League in 1995 and called C.O. Brown Stadium in Battle Creek, Michigan home.
 The franchise had previously been located in Madison, Wisconsin in 1994 where they were called the Madison Hatters.
 Prior to that the team was located in Springfield, Illinois and was known as the Springfield Cardinals.
 Upon moving to Battle Creek the team initially sought the name Battle Creek Golden Kazoos to help create a regional tie-in with the city of Kalamazoo, Michigan, but legal disputes led to the adoption of the Battle Cats moniker.
 The team became known as the Battle Creek Yankees beginning with their affiliation in 2003 with the New York Yankees, and again changed names and affiliations in 2005 and became the Southwest Michigan Devil Rays.
 In 2007, citing declining attendance, the team moved to Midland, Michigan and became the Great Lakes Loons.
Billings Logan International Airport (IATA: BIL, ICAO: KBIL, FAA LID: BIL) is two miles northwest of downtown Billings, in Yellowstone County, Montana.
 It is the second largest airport in Montana, having been surpassed by Bozeman in both number of gates as well as annual enplanements in recent years, and is owned by the city of Billings.
 The airport is on top of the Rims, a 500 ft cliff overlooking the downtown core.
 BIL covers 2,300 acres (9.3 sq.km.)
 of land.
Kalamazoo/Battle Creek International Airport (IATA: AZO, ICAO: KAZO, FAA LID: AZO) is a county-owned public airport 3 mi southeast of Kalamazoo, in Kalamazoo County, Michigan.
 The airport is located approximately 20 mi west of the city of Battle Creek.
 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 non-hub primary commercial service facility.
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.
Newman's Airport (FAA LID: 4N0) is a privately owned, public airport located 7 mi (11.3 km) west of Kalamazoo, Michigan, United States.
 It is a choice for many pilots in the area who wish to avoid the Kalamazoo-Battle Creek International Airport.
 Newmans is an airpark community.
 The airport offers tie-downs, and hangars.
Corporate Air is an airline based in Billings, Montana, United States.
 It was established in 1981 and operates primarily domestic scheduled cargo services, Feeder service on behalf of FedEx Express, as well as the United States Postal Service.
 Its main base is Billings Logan International Airport.
Battle Creek is a city in the U.S. state of Michigan, in northwest Calhoun County, at the confluence of the Kalamazoo and Battle Creek rivers.
 It is the principal city of the Battle Creek, Michigan Metropolitan Statistical Area (MSA), which encompasses all of Calhoun County.
 As of the 2010 census, the city had a total population of 52,347, while the MSA's population was 136,146.

Question: Kalamazoo/Battle Creek International Airport and Billings Logan International Airport, have which mutual type of attribute?
Answer: International