Which of the following is NOT a Flight Information Region in Canada?

Chicago is not a Flight Information Region (FIR) in Canada because it belongs to the United States' air traffic control system. Similar to the United States, Canada has designated FIRs to manage air traffic over its territory, including Vancouver, Edmonton, and Moncton. Each of these regions provides air navigation services and facilitates communication and coordination among aircraft operators and air traffic controllers. The distinction is important in understanding the differences in airspace management and international aviation operations, marking Chicago as part of the U.S. rather than Canada's FIR structure.