I'd love to see some International routes from DND. An airline like KLM which does offer worldwide connections with one stop would be great! It'd certainly be able to attract many students from the rest of Europe and further afield, although this would only really be around the start/end of term times, although I'm sure tourism and business would also be quite high at other times.
I personally can't see it happening though. Does Dundee have appropriate immigration and customs services anyway?