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Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., and the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions with 6.245 million residents in 2020. The city's population at the 2020 census was 1,603,797, and over 56 million people live within 250 mi (400 km) of Philadelphia.

Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's independence. Philadelphia hosted the First Continental Congress in 1774 following the Boston Tea Party, preserved the Liberty Bell, and hosted the Second Continental Congress during which the founders signed the Declaration of Independence, which historian Joseph Ellis has described as "the most potent and consequential words in American history". Once the Revolutionary War commenced, both the Battle of Germantown and the Siege of Fort Mifflin were fought within Philadelphia's city limits. The U.S. Constitution was later ratified in Philadelphia at the Philadelphia Convention of 1787. Philadelphia remained the nation's largest city until 1790, when it was surpassed by New York City, and served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions during and following the American Revolution, including from 1790 to 1800 while the new national capital of Washington, D.C., was under construction.

With 18 four-year universities and colleges, Philadelphia is one of the nation's leading centers for higher education and academic research. As of 2021[update], the Philadelphia metropolitan area was the state's largest and nation's ninth-largest metropolitan economy with a gross metropolitan product (GMP) of US$479 billion. The city is home to five Fortune 500 corporate headquarters as of 2022. The Philadelphia skyline, which includes several globally renowned commercial skyscrapers, is expanding, primarily with new residential high-rise condominiums. Philadelphia and the Delaware Valley are a biotechnology and venture capital hub; and the Philadelphia Stock Exchange, owned by NASDAQ, is the nation's oldest stock exchange and a global leader in options trading. 30th Street Station, the city's primary rail station, is the third-busiest Amtrak hub in the nation, and the city's multimodal transport and logistics infrastructure, including Philadelphia International Airport, the PhilaPort seaport, freight rail infrastructure, roadway traffic capacity, and warehouse storage space, are all expanding.

Tong Dong Autonomous County is located at the southernmost tip of Huaihua City, Hunan Province, at the junction of Hunan, Guangxi and Guizhou provinces (regions). It is the main road leading to the southwest of China. Located in the transitional zone from the eastern edge of the Yunnan-Guizhou Plateau to the Nanling Mountains, Xuefeng Mountain extends to the southwest, belonging to the Yangtze River and Pearl River systems. It is bordered by Suining County and Chengbu Miao Autonomous County in Hunan Province to the east, Miao and Dong Autonomous County in Jingzhou to the north, Sanjiang Dong Autonomous County and Longsheng County in Guangxi Zhuang Autonomous region to the south, and Liping County in Guizhou Province to the west. Historically, Tongdao County is the corridor zone between Chu and Yue, which is known as "South Chu Polar region" and "Baiyue flap throat". The territory is 58 kilometers wide from east to west and 68 kilometers from north to south, with a total area of 2239 square kilometers, accounting for 1.4 percent of the total area of the province. There are mainly 14 fraternal ethnic groups, mainly Dong, Han, Miao and Yao.
Airport In Tongdao - Huaihua Zhijiang Airport
Huaihua Zhijiang Airport (Huaihua Zhijiang Airport, IATA: HJJ, ICAO: ZGCJ), referred to as "Zhijiang Airport", is located in the eastern suburb of Zhijiang Dong Autonomous County, Huaihua City, Hunan Province, 31 kilometers northeast of Huaihua City, northwest of Zhijiang Jiang Station is 5 kilometers away. It is a 4C-level military-civilian joint feeder airport. The predecessor of the airport "Zhijiang Airport" is known as "the second largest strategic airport in the Far East".     .
In October 1938, Zhijiang Airport was completed and opened to navigation   ; In January 2003, Huaihua Zhijiang Airport officially started construction; on December 19, 2005, Huaihua Zhijiang Airport officially opened to navigation; on March 30, 2017, the runway of Huaihua Zhijiang Airport was extended to 2600 meters   .
As of February 2021, the temporary terminal of Huaihua Zhijiang Airport has an area of ​​2,000 square meters, and the area of ​​the civil aviation station is 27,065 square meters. There are 3 C-class seats and 1 B-class seat; the runway is 2,600 meters long, 45 meters; can guarantee the use demand of 400,000 passenger throughput and 9,600 tons of cargo and mail throughput in 2020     .
In 2021, Huaihua Zhijiang Airport will complete an annual passenger throughput of 349,195 passengers, a year-on-year decrease of 9.6%, ranking 157th in the country; cargo and mail throughput of 7.6 tons, a year-on-year decrease of 36.8%, ranking 215th in the country; aircraft movements of 32,886 sorties, a year-on-year increase of 47.6%, ranking 71st in the country   .
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