Interesting comments regarding leisure routes that aren't bucket and spade and German routes.
I may be biased (having just returned from there) but I think Munich could work. Decent connectivity to the LH network, good "city break" leisure destination, and a gaping hole on the NCL route map. Anyone know if the UK has any military bases there also?
If SN can support a daily Brussels connection , with poor timing for connections, (When AMS isn't too far away with superior frequency and connections) surely someone could make a go of this.
ReadyToGo