information:extraction, structural:scholar_edition, structural:reformatting
Reconstruction

On the day of the attacks, New York City mayor Rudy Giuliani stated: "We will rebuild. We're going to come out of this stronger than before, politically stronger, economically stronger. The skyline will be made whole again".

Within hours of the attack, a substantial search and rescue operation was launched. After months of around-the-clock operations, the World Trade Center site was cleared by the end of May 2002. The damaged section of the Pentagon was rebuilt and occupied within a year of the attacks. The temporary World Trade Center PATH station opened in late 2003 and construction of the new 7 World Trade Center was completed in 2006. Work on rebuilding the main World Trade Center site was delayed until late 2006 when leaseholder Larry Silverstein and the Port Authority of New York and New Jersey agreed on financing. The construction of One World Trade Center began on April 27, 2006, and reached its full height on May 20, 2013. The spire was installed atop the building at that date, putting One WTC's height at 1,776 feet (541 m) and thus claiming the title of the tallest building in the Western Hemisphere. One WTC finished construction and opened on November 3, 2014.

On the World Trade Center site, three more office towers were to be built one block east of where the original towers stood. 4 WTC, meanwhile, opened in November 2013, making it the second tower on the site to open behind 7 World Trade Center, as well as the first building on the Port Authority property. 3 WTC opened on June 11, 2018, becoming the fourth skyscraper at the site to be completed. In December 2022, the Nicholas Greek Orthodox Church fully reopened for regular services followed by the opening of the Ronald O. Perelman Performing Arts Center in September 2023. With construction beginning in 2008, 2 World Trade Center remains as of 2023 unfinished. Construction of a 5 World Trade Center is planned to begin in 2024 and be finished by 2029.

Christopher O. Ward, Port Authority of New York and New Jersey Executive Director from 2008 to 2011, is a survivor of the attacks and is credited with getting the construction of the 9/11 site back on track.