My guess(as stated before) is that KLM will drop the third lunchtime flight soon.
I doubt it. KLM operate at least 3xDaily to all the UK airports they serve
Cant see the Southampton lasting ,weekends only..no business passengers for a start?
I imagine it's been retained for operational convienence. ABZ-MME unable to sustain a flight on it's own on a Sunday, likewise ABZ-SOU. So combine the two and sell the seats between MME-SOU for some bonus income
Similarly T3 operate NWI-HUY-ABZ on a Sunday, albeit not selling NWI-HUY leg