I believe the British Eagle proposed service linking Dundee and Glasgow was to use a De Havilland Dove, which could have used the grass airfield at Dundee. There were various attempts over the years to connect Dundee to the Central Belt airports, by both air and road. In the 1970s both BEA/BA and B Cal operated dedicated coach services from Dundee to Edinburgh Turnhouse, with the coaches painted up in the airline colours. You used to see them, parked one behind the other, waiting in the evening outside the old terminal at Turnhouse for the Vanguard from Heathrow and the B Cal One-Eleven from Gatwick. I never saw more than a handful of passengers in either as they left.
The 1968 Autair service, although the proving flights used 748s, started with Heralds; Autair had bought three of these secondhand, which were familiar with Scotland as they were the old BEA Herald fleet used from Glasgow. These flights operated via Blackpool, Carlisle or nonstop to Luton, different arrangements each day of the week, and on summer Saturdays they did trips from Leuchars to Jersey, which required customs clearance northbound and thus stopped in at Luton. The 1968 Luton timetable from Leuchars is here.
http://www.timetableimages.com/ttima...68/ou68-04.jpg