What is the airport code for Milwaukee?

The airport code for Milwaukee is MKE, which stands for General Mitchell International Airport. Airport codes are typically assigned based on the geographical location or the name of the airport, and MKE is derived from the name "Mitchell." This three-letter code is used in airline ticketing, baggage handling, and flight operations to uniquely identify the airport amidst thousands of others worldwide.

The other options represent different airports: MSN is the code for Dane County Regional Airport in Madison, Wisconsin; HSV is for Huntsville International Airport in Alabama; and FSD is for Sioux Falls Regional Airport in South Dakota. Each of these codes is specific to their respective airports, which helps to avoid confusion in air travel.