Did you already receive something on housing?
My Oldest D attends Ohio State too and there is NOT a campus bus that goes to and from the airport. She normally takes a cab and it costs about $25 one way with tip. The COTA bus does go to and from the airport to OSU's campus. BTW, I found out the COTA bus does go to Westerville and the kids at Otterbein can hop on it and go shopping or to OSU etc. There is a map you can click on, on their site but it's a little hard to read. I think I will contact them to find out routes, fares etc for the Otterbein kids. The fare is included in the OSU kids tuition and all they have to do is show their Buck ID card to ride. Here's the link to their site:
http://www.cota.com/transit_maps.asp