East West also did SYD-YBOK(Oakey)-SYD servicing Toowoomba in 1979 using F27. My Dad was the East West rep in Toowoomba. Remember going out to Oakey to watch the planes then ended back there flying for the Army about 5 years later.
My Dad also worked in Armidale. I remember many a long night for him busing the pax to/from Tamworth due to the fog at Armidale. Only a NDB apch back then. Also with the height the F27 was weight limited off the runway. Many a day spent juggling the load and balance sheet to make it work.