You are responsible for your own transportation to/from Detroit Metro Airport.
Detroit is a Delta airlines hub, but it is also served by most major airlines. It is a 30-minute drive from U-M campus.
We recommend booking a seat on the AirRide/Michigan Flyer, which offers one-way fare of $12. The bus picks up/drops off at the Blake Transit Center near central campus (about a 15-minute walk from Ross) and the Kensington Court Hotel on the south side of town.
As an alternative, taxis from the airport to Ann Arbor typically cost $50-60.