IT was common with Macair when operating on the milkrun between Isa-Birdsville-Bris as well. Ansett did it as well when they ran the ALice-Tennant-Katherine-darwin run.
Situation awareness.. I fly a Jab160 @ 86knts.. about 8 min from the 10 mile call till I'm over the airfield. It's nice to know what's coming in my direction when I'm still on decent from 5000' outside the 10mile limit..
I've noticed that Skywest tend to do a very high rate decent / climbs into and out of most aerodromes so that awareness of both our postions becomes even more important. (understand the reasoning so not a hit at skywest).