Chicago is one of the most connected cities in the world, serving as a primary node for U.S. transit and freight.
* **Public Transit:** The Chicago Transit Authority (CTA) operates the nation's second-largest public transit system, anchored by the iconic "L" (elevated) train network and an extensive bus system. * **Commuter Rail:** Metra provides extensive commuter rail service connecting the downtown terminals to the sprawling suburbs. * **Airports:** O'Hare International Airport (ORD) is one of the busiest global aviation hubs. Midway International Airport (MDW) serves as a major domestic hub, largely for Southwest Airlines. * **Rail & Freight:** Chicago is the largest hub in the North American railroad industry; it is the only city where all six Class I North American railroads meet. * **Active Transit:** The city is highly walkable in its core and features the Divvy bike-share system, alongside the Lakefront Trail, a continuous 18-mile paved path along Lake Michigan.