MNM - Menominee MI/Marinette WI
Thirty years ago, Great Lakes Aviation had a Lake Michigan hopscotch flight across Lake Michigan up to Menominee. Took it to be in a friends wedding. No longer has passenger service. One room just wide enough for a desk and a commercial scale for weighing passengers and luggage
I remember I had to call the airport manager at his house (!) on the morning of my scheduled flight back to alert him I was still planning on flying. He then radioed the aircraft to come pick me up at the scheduled time. More like a flying taxi service