I recall a conversation I had with LAF airport manager Stroud a few years ago. He said the largest aircraft to ever operate from the airport was DC-8-60 series. He told me that the aircraft was too heavy for the runway, and some damage was done to the asphalt due to the a/c being over the max permitted weight for the runway. Personally, the largest a/c I ever witnessed at LAF was a HP A320, carrying the OSU football team (boo.) 727's and DC-9's are frequent visitors during football season. Purdue used to charter from TWA, I don't know if they still do.