Excellent post and research above. Let me add one to that -
Ft. Worth to Dallas. I have a 1966 OAG that shows Eastern running a 727 on the route. I believe Braniff or American had a jet flight on this route as well. I'll be home in a couple of days and will try to verify this.
Also, West Coast/Air West/ Hughes Air West used to operate an F27 between Seattle and Tacoma.
Additionally, Air West also used to fly LAX-Riverside with its F27s.