How many terminals does O'Hare Airport have?

O'Hare International Airport has a total of four terminals. Each terminal is designated for specific airlines and serves a mix of domestic and international flights. Terminal 1 primarily serves United Airlines, Terminal 2 is used by various domestic carriers including American Airlines, Terminal 3 is another hub for American Airlines, and Terminal 5 is dedicated to international flights. The layout and functionality of these four terminals help in managing the significant volume of passenger traffic that O'Hare experiences, making it one of the busiest airports in the world. Understanding the structure and operational capacity of the terminals is crucial for both travelers and airport personnel in efficiently navigating the airport's services.