Without drifting too far off the thread, Rex and qlink are direct competitors, they compete for the same passengers at the same time that said passengers want to travel. It is in the same realm of comparing QF and VA 737 schedules
It is a very common occurrence to have a Saab and a q400 parked at some regional airport that have both come from the same place and returning to that place. The only caveat to this is that Rex tend to do more triangular services which ad a stop on the way back to the capital city (broken hill-dubbo-sydney).