Tetsutaka Sugawara has a series of books on this very topic. "Aikido and Chinese Martial Arts". I believe two volumes have been released and three are planned (someone please correct me if I'm wrong).
To the best of my knowledge, Sugawara Sensei travels once a year to the United States to teach. If you are interested, I can see when and where he will be in the US. (Any Katori Shinto Ryu folks lurking with better information?)