Which terminal corresponds to Concourses G, H, K, and L?

The correct answer is Terminal 3, which serves Concourses G, H, K, and L at O'Hare Airport. Terminal 3 is one of the key terminals at the airport and is primarily used by certain airlines for both domestic and international flights. Understanding the layout of terminals and their corresponding concourses is essential for efficient navigation and for ensuring that passengers can easily find their flights, gates, and services.

Terminal 1 is associated with Concourses B and C, primarily serving United Airlines and its partners. Terminal 2 caters to a different set of airlines, including some international carriers, and covers Concourses E and F. Terminal 4 is designated for international travel and serves specific international flights, but it does not include the mentioned concourses. Thus, it is clear that Terminal 3 is the correct terminal for Concourses G, H, K, and L.