My mare was by Flugzauber. She was foaled in 1988, so I'm guessing Flugzauber is at least in his late 20's. At the time, he was owned by the Dresslers in NJ. He was registered with the Purebred Hanoverian Owners and Breeders Association. Perhaps googling them would give you some contact information.
I have seen several Flugzauber offspring, and have been riding a Swedish mare sired by him for a year and a half now. I would not personally breed to him if he were availabe. Feel free to PM me for details.
If you are interested in breeding to him or breeding one of his daughters, the Dresslers would be the best people to contact, as all of the offspring I know were bred by or came from them.