My wife and I both came down last April (probably about out of your timeline). My wife caught it, we believe, while traveling back from Michigan. It was the Saturday that Spring Break travel started and DTW was a zoo. I caught it from her. We've both been vaccinated (4th time) since.
I know the arguments about plane travel, but a lot of them don't take into account the airport terminals themselves, especially crowded TSA lines as well as the cattle call atmosphere on the jetway while boarding.