Operating out of Concourse D of Milwaukee Mitchell International Airport is Frontier Airlines MKE Terminal. There are two concourses at the airport: Concourse C and Concourse D. The terminal building is the only structure. Gates D27 through D56 on Concourse D are used by American, Alaska, Delta, and Frontier Airlines. This concourse houses Frontier's check-in desks, baggage claim, and boarding gates. Concourse D offers a variety of services to passengers, including lounges, retail stores, and food options. Arriving at least two hours before departure is advised for a more seamless travel experience, as boarding starts 45 minutes before flight and check-in and luggage drop close 60 minutes before departure.
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