I suspect flights to Aberdeen are almost all work/business related and so aren't terribly price sensitive.
A lot of the traffic is lads going to/from the rigs who have to pay their own way, so it is
hugely price sensitive between MME, NCL, road and rail. There isn't huge pent up demand, it just switches between the different choices.
Go into almost any pub in the northeast and mention the word Aberdeen, and you will find somebody who will explain how the working man gets screwed on travel, in detail and at great length, including the train and road options - 'good' won't feature in the discussion.