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Indianapolis (/ˌɪndiəˈnæpəlɪs/), colloquially known as Indy, is the state capital and most populous city of the U.S. state of Indiana and the seat of Marion County. According to the U.S. Census Bureau, the consolidated population of Indianapolis and Marion County was 977,203 in 2020. The "balance" population, which excludes semi-autonomous municipalities in Marion County, was 887,642. It is the 15th most populous city in the U.S., the third-most populous city in the Midwest, after Chicago and Columbus, Ohio, and the fourth-most populous state capital after Phoenix, Arizona, Austin, Texas, and Columbus. The Indianapolis metropolitan area is the 33rd most populous metropolitan statistical area in the U.S., with 2,111,040 residents. Its combined statistical area ranks 28th, with a population of 2,431,361. Indianapolis covers 368 square miles (950 km2), making it the 18th largest city by land area in the U.S.

Indigenous peoples inhabited the area dating to as early as 10,000 BC. In 1818, the Lenape relinquished their tribal lands in the Treaty of St. Mary's. In 1821, Indianapolis was founded as a planned city for the new seat of Indiana's state government. The city was platted by Alexander Ralston and Elias Pym Fordham on a 1-square-mile (2.6 km2) grid next to the White River. Completion of the National and Michigan roads and arrival of rail later solidified the city's position as a manufacturing and transportation hub. Two of the city's nicknames reflect its historical ties to transportation—the "Crossroads of America" and "Railroad City". Since the 1970 city-county consolidation, known as Unigov, local government administration operates under the direction of an elected 25-member city-county council headed by the mayor.

Indianapolis anchors the 29th largest economic region in the U.S., based primarily on the industries of trade, transportation, and utilities; professional and business services; education and health services; government; leisure and hospitality; and manufacturing. The city has notable niche markets in amateur sports and auto racing. The city is home to three Fortune 500 companies, two major league sports clubs (Colts and Pacers), five university campuses, and several museums, including the world's largest children's museum. However, the city is perhaps best known for annually hosting the world's largest single-day sporting event, the Indianapolis 500. Among the city's historic sites and districts, Indianapolis is home to the largest collection of monuments dedicated to veterans and war casualties in the U.S. outside of Washington, D.C.

Yanji City belongs to Yanbian Korean Autonomous Prefecture of Jilin Province. Yanji City is the center of politics, economy, culture and foreign exchanges of the whole prefecture. It is located in the east of Jilin Province, the middle of Yanbian Prefecture, the northern foot of Changbai Mountain, the hinterland of Northeast Asia economic circle, and a fulcrum of the Tumen River "Golden Triangle" drawn up by the United Nations. It is only 60 kilometers away from the Sino-Russian border, 80 kilometers away from the Sea of Japan, and more than 10 kilometers away from the border between China and North Korea in the south. Yanji is a central city in the east of Jilin Province, an excellent tourist city in China and one of the top 100 counties in China. The comprehensive economic strength of Yanji county has always been in the first place in Jilin Province. The scenic spots in Yanji are: Maoershan National Forest Park, Chengzishan Mountain City site, Mengdu Beauty Folk Tourism Resort, Chunxing Village, Korean ancient village and so on. Yanji is listed as the first batch of national new urbanization.
Airport In Yanji - Yanji Chaoyangchuan International Airport
Yanji Chaoyangchuan International Airport (Yanji Chaoyangchuan International Airport, IATA: YNJ, ICAO: ZYYJ), located in Chaoyangchuan Town, Yanji City, Yanbian Korean Autonomous Prefecture, Jilin Province, is a 4C-level military-civilian airport.  
Yanji Chaoyangchuan International Airport was built in 1952. In 1985, with the approval of the State Council and the Central Military Commission, Yanji Chaoyangchuan Airport was converted into a military-civilian airport. On August 29, 1985, Yanji Chaoyangchuan Airport opened civil aviation routes. In December 1993, Yanji Chaoyangchuan Airport completed the flight area expansion project. In April 1997, the new terminal building project was completed. On June 9, 2017, it was approved by China Civil Approved by the Aviation Administration, the name was changed to Yanji Chaoyangchuan International Airport.   
As of April 2022, Yanji Chaoyangchuan International Airport has a terminal building with an area of ​​21,720 square meters, 4 covered bridges, 11 parking stands, and a 2,600-meter-long runway. It has 16 domestic and foreign waypoints, including 15 domestic waypoints and 1 foreign waypoint.   
In 2021, the passenger throughput of Yanji Chaoyangchuan International Airport will be 580,500, a year-on-year increase of 1.4%, ranking 123rd in the country; the cargo and mail throughput will be 3,691.1 tons, a year-on-year decrease of 1.3%, ranking 82nd in the country, with 6,087 take-offs and landings, A year-on-year increase of 6.0%.  
At 16:05 on October 30, 2022, the Chengdu Tianfu-Yantai-Yanji round-trip route was officially opened.  
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