I doubt that the following two news items are related, but they should be.
If you want cheaper air fares out of Traverse City then there needs to be a viable competitor such as rail.
At the beginning of the week The Ticker reported renewed interest in passenger rail: Passenger Train to TC?
Then later in the week the TC Chamber of Commerce released the letter received from Delta and it was reported in the news that TVC would be seeing lower air fares. See IPR: Delta To Add Seats Into TC
Again, I do not think Delta lowered fares to head off any possibility of passenger rail but in a perfect world that is how it would work.