The down turn in the oil industry has obviously affected such routes as DTV to Norwich with minimal loads so I can't see a link to Stavanger fairing any better during the down turn and I would have thought that if there was sufficient demand an airline would have resumed a link from Newcastle by now.
Companies say that they are 'fully committed' all the time it's just
PR most of the time unless any written agreement is signed it means sod all, look at how many airports that have had airlines saying that and before you know it they are history.
I wouldn't hold my breath regarding Loganair having a long term relationship with DTV, I'm not knocking the airport in anyway but that's how I personally see it.
The limited amount of Guernsey flights could always remain at DTV considering that they are aligned with a travel company so seat sales more or less will be taken up especially considering the amount of flights available.