Audio Path for ABC, CBS, NBC, PBS

So I was looking for a price list on Dolby multichannel encoders, and came across this page. Dolby has PDFs available for ABC, CBS, NBC & PBS detailing the pathway the original feed takes from satellites through your local affiliate and finally into your HDTV. It is interesting to note that only NBC gives the local station the full uncompressed audio stream to all it's affiliates. ABC does give a nice 640Kb/s AC3 stream however, and CBS gives a Dolby E stream (a Dolby technology which encodes up to an 8 channel digital stream into 2 uncompressed audio channels). Now if only all the local stations could give Bozeman the surround sound goodness available in the source (KTVM excepted, of course).