Dundee's runway has already been extended once.
I had a discussion with the ATC controller about the possibility of 737s using DND,and was told that it isn't just a length problem,but lateral as well. Apparently,under current regulations,the runway is too close to the airfield boundaries on either side to permit that size of aircraft.
Does anybody remember the DND--GLA service flown by the Heron G-ANNO? I think it was McDonald Aviation? No really!
Also,not many know that the airport fire service has a rescue BOAT (and it has been used in a real emergency)