I'm looking for Air Force link to Kenneth Arnold's 1947 "flying saucers" sighting.

This might be of use: PROJECT 1947 - Kenneth Arnold

Here is a radio broadcast from shortly after the alleged sighting: Kenneth Arnold Interviewed by Bill Berquette on June 25, 1947 - YouTube

This is also a fascinating resource as Arnold was interviewed by Edward R Murrow just a few years after the alleged sighting: Case of the Flying Saucer with Edward R. Murrow - UFOs - FREE MOVIE - YouTube