In reviewing the NOTAM I'm left with a question that doesn't seem to be adressed. There are two stream's of traffic at 1800'/90kt and 2300'/135kt navagating the same route inbound. I'm trying to visulize at some point the higher and faster stream decending into the lower and slower stream. Is this what happens or do they land the top stream long and keep them separated or??? I flew once before years ago as a passenger but never noticed this. It would seem that the preferable entrance would be the higher/faster one?