Now that Eastern are out of the way, watch the prices rise on the Aberdeen route. Currently you can fly MME-ABZ pretty much any day between September and December for £71 one way Sunday-Thursday and £78.70 on a Friday. Let's check again in a month's time.
Eastern/Air Kilroe have served Teesside-Aberdeen for well over 30 years (maybe longer) but 2 operators on that route was never going to last in the long term.