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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.

Chang'an District, Xi'an City, Shaanxi Province is located in the hinterland of Guanzhong Plain, south by Qinling Mountains, surrounded by Xi'an from the west and south, with mountains, rivers and plateaus, with a total area of 1580 square kilometers and 25 subdistrict offices. The resident population of the region is 1.130213 million (2019) and the registered permanent population is 1.083 million (2016). Changan District has a superior location and convenient transportation, and the Weiqu residence of the district government is only 8.7 kilometers away from the clock tower in the core of Xi'an. Ancient Chang'an was once the capital of 13 dynasties, including Zhou, Qin, Han and Tang dynasties. There are ten sites including the Fenghao site of the Zhou Dynasty, the Afang Palace of the Qin Dynasty, and eight famous mountains, including Cuihua Mountain, Wutai Mountain, Xiangyu Mountain and Qinghua Mountain. There are 42 monasteries, including Xingjiao Temple, Huayan Temple, Xiangji Temple, and the ten major sects of Buddhism, including Fa Xiangzong, Pure Land sect and Huayan Temple.
Airport In Chang'an District - Shijiazhuang Zhengding International Airport
Shijiazhuang Zhengding International Airport (IATA: SJW, ICAO: ZBSJ), located in the northeast of Zhengding County, Shijiazhuang City, Hebei Province, China, is 32 kilometers away from the urban area. Important air gateway, alternate airport of Beijing Capital Airport, regional aviation hub   , An important international air cargo transit base in northern China.  
Shijiazhuang Zhengding International Airport officially opened on February 18, 1995. In March 1996, Shijiazhuang Air Port was officially opened to the outside world. In July 2008, Shijiazhuang Zhengding Airport was renamed "Shijiazhuang Zhengding International Airport". The total length of the airport runway is 3,400 meters. There are two terminal buildings, No. 1 and No. 2, with a total area of ​​209,000 square meters.  
In 2020, Shijiazhuang Zhengding International Airport will handle 8.203 million passengers, a year-on-year decrease of 31.2%; cargo and mail throughput will be 86,390.4 tons, a year-on-year increase of 62.3%; aircraft movements will be 76,800, a year-on-year decrease of 1.4%.  
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