What city in the US has the second busiest airport in the world when measured by aircraft traffic as of 2017?

Chicago was incorporated as a city in 1837 near a portage between the Great Lakes and the Mississippi River watershed and grew rapidly in the mid-nineteenth century. After the Great Chicago Fire of 1871, which destroyed several square miles and left more than 100,000 homeless, the city made a concerted effort to rebuild on the damage. The construction boom accelerated population growth throughout the following decades, and by 1900 Chicago was one of the five largest cities in the world. During this period Chicago made noted contributions to urban planning and zoning standards, new construction styles (including the Chicago School of architecture), the development of the City Beautiful Movement, and the eventual creation of the steel-framed skyscraper.

Positioned along Lake Michigan, the city is an international hub for finance, commerce, industry, technology, telecommunications, and transportation. O'Hare International Airport is the second busiest airport in the world when measured by aircraft traffic; the region also has the largest number of U.S. highways and railroad freight. In 2012, Chicago was listed as an alpha global city by the Globalization and World Cities Research Network, and it ranked seventh in the world in the 2016 Global Cities Index.