What is what airport is mdw an abbreviation for?

MDW is the abbreviation for Chicago Midway International Airport. It is located on the southwest side of Chicago, Illinois, and is the second-largest airport in the Chicago metropolitan area, serving domestic flights and some international destinations. The airport was originally built in 1927 and was a major hub for Southwest Airlines until the early 2000s. Today, it is still a hub for Southwest and serves around 22 million passengers annually.