Which city corresponds to the airport code ORD?

The airport code ORD corresponds to Chicago, Illinois. This code is derived from the historical name of the airport, which was originally called Orchard Field. The use of the three-letter code is part of a standardized system developed by the International Air Transport Association (IATA) to simplify the identification of airports in air travel. Chicago O'Hare International Airport is one of the busiest airports in the United States, making it significant for travelers and airlines alike.

Understanding the origins of these codes helps in memorizing them, as they often reflect geographical or historical features of the area. Other cities mentioned do not share this historical connection or the same airport designation, and thus they correspond to different airport codes altogether. For instance, Orlando has the airport code MCO, Omaha uses OMA, and Oakland has a different code as well. This distinction is crucial for correctly identifying airports during travel planning and booking flights.