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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.

Erqi District is the central city of Zhengzhou, the capital of Henan Province, named for commemorating the general strike of the Beijing-Han Railway on February 7, 1923. It is located in the southwest of the center of Zhengzhou, bordered by Guancheng District in the east, adjacent to Zhongyuan District and Xingyang City in the west, Xinmi City and Xinzheng City in the south, and Jinshui District in the north. As of 2017, Erqi District covers a total area of 159square kilometers, has 17 streets, has a resident population of 801500, and the urbanization rate is 90.39%. Erqi District has a long history and heavy culture. There are Han Dynasty dwellings Denggongzhai, Ming Dynasty Zhou mourning Wang Mausoleum and many other historical sites. The site of Lao Nu Temple in Zhengzhou pushed forward the origin of Chinese civilization for 30-50 000 years; the blue-glazed porcelain of the Shang Dynasty advanced the firing history of Chinese porcelain by more than 1000 years; Yan ceramics, Zheng Shang porcelain and other porcelain have gone abroad and entered the world. One hundred years
Airport In Erqi District - Zhengzhou Xinzheng International Airport
Zhengzhou Xinzheng International Airport (Zhengzhou Xinzheng International Airport, IATA: CGO, ICAO: ZHCC), referred to as "Xinzheng Airport", is located at the junction of Xinzheng City and Zhongmu County, Zhengzhou City, Henan Province, China. It is a 4F international civil airport and the first in China The core component of Zhengzhou Airport Economic Comprehensive Experimental Zone, a national airport   , an international air cargo hub airport, one of the eight major regional hub airports in China   , "7×24 hours" "full time" customs clearance international airports, large domestic aviation hub airports   , international scheduled flight airports, and national first-class air ports open to the outside world.     
On August 28, 1997, Zhengzhou Xinzheng International Airport was completed and opened to traffic. In May 2013, the relocation of the second phase of the project began. In January 2014, the second phase of the reconstruction and expansion project started construction. On December 22, 2015, the second phase expansion project of Zhengzhou Xinzheng International Airport was officially put into operation. On January 7, 2016, the second runway of Zhengzhou Xinzheng International Airport was opened. On March 30, 2016, the T1 terminal was closed for renovation, and all flights were moved to the T2 terminal.
As of December 2015, Zhengzhou Xinzheng International Airport has two terminals (T1 terminal is out of service), with a total area of ​​620,000 square meters; T1 and T2 terminals have 158 parking bays, including 149 passenger aircraft parking bays ; It has two runways, 3400 meters and 3600 meters respectively.   As of December 2018, Zhengzhou Xinzheng International Airport has 55 passenger airlines, 208 passenger routes, and 116 passenger cities; 21 cargo airlines, 34 cargo routes, and 40 cargo cities.   
In 2020, the passenger throughput of Zhengzhou Xinzheng International Airport was 21.4067 million passengers, a year-on-year decrease of 26.5%, ranking 11th in the country; the cargo and mail throughput was 639,400 tons, a year-on-year increase of 22.5%, ranking 6th in the country, with 178,600 transport movements , a year-on-year decrease of 17.4%.  
On August 16, 2022, the North Cargo Area of ​​Zhengzhou Xinzheng International Airport will start trial operation.  
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