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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.

Saertu District is a municipal district of Daqing City, Heilongjiang Province. Saertu, which means "the place where the moon rises" in Mongolian, is located in the northeast of Daqing city. It is located at 124 °52 degrees east longitude and 125 °12 degrees east longitude, 46 °32 degrees north latitude and 46 °52 degrees north latitude. The whole territory is long from north to south and wide from east to west, with a total area of 548 square kilometers. The terrain in the east is slightly higher than that in the west, and the altitude is between 145 and 155 meters above sea level. The geomorphological appearance is a undulating low plain. There are scattered sand dunes in the southwest and northwest. It is located in the north temperate zone of Eurasian continental monsoon climate. Due to the distance from the sea and the influence of the cold air in the interior of Mongolia and the warm monsoon of the Sea of Japan, the climate shows a semi-humid and semi-arid temperate climate type with significant changes in the four seasons. Saertu District has nine streets with a total population of 33.88.
Airport In Saertu District - Daqing Saertu Airport
Daqing Sartu Airport (Daqing Sartu Airport, IATA: DQA, ICAO: ZYDQ), located at the junction of Sartu District, Daqing City, Heilongjiang Province, China and Anda City, Suihua City, 17.5 kilometers away from the eastern urban area of ​​Daqing City, and west of Daqing City The urban area is 22.5 kilometers away, and it is a 4C-level domestic feeder airport in China   .
In October 2008, the construction of Daqing Sartu Airport started; on September 1, 2009, Daqing Sartu Airport was officially opened to navigation; on June 15, 2019, the construction of the international terminal of Daqing Sartu Airport started   .
According to the official website of the airport in February 2021, the terminal building of Daqing Sartu Airport covers an area of ​​13,987 square meters, with 4 boarding bridges; the civil aviation station has 8 seats, including 1 class B seat and 6 C seats. Class aircraft stand, 1 dedicated deicing stand; the runway is 2,600 meters long and 45 meters wide; it can meet the needs of an annual passenger throughput of 1.47 million and a peak hour of 933 passengers   .
In 2019, Daqing Sartu completed a total of 858,021 passenger throughput, a year-on-year increase of 3.2%, ranking 117th in the country; cargo and mail throughput was 1,324.6 tons, a year-on-year decrease of 6.7%, ranking 111th in the country; aircraft movements took off and landed 6,697 , ranked 148th nationally   .
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