D2A2 is a pilot commuter bus service connecting Detroit and Ann Arbor, MI. The new bus service is an idea created by the Regional Transit Authority of Southeast Michigan (RTA), in partnership with the Ann Arbor Area Transportation Authority (TheRide) and operated by Michigan Flyer. The service provides hourly trips between the two communities for 16 hours a day during the week (6:00 a.m.-11:00 p.m.) and limited service on Saturday and Sunday. The D2A2 service offers convenient, affordable and reliable transportation for patrons between the two cities. One-way fares for this service are $8 base fare, $6 advanced booking discount, $5 Book of 10 and $4 eligible senior/disability fare.