Totally agree with some of the points skyman made there.
Mainly seasonal route but needs business support and as you said loyalty schemes.
Hard to get people to transfer over for a few months.
Maybe if we had a different airline say Delta as they are part of the KLM/AF codeshare group could a seasonal service had worked with them as the business pax fly direct
Again it would be interesting to see how many of the monthly passengers then went onwards to somewhere else it's a shame that these figures we never find out