costs presumably? Significant fuel saving operating from an airport on the coast might sway them.
But surely most of the fuel cost is in the climb? The slightly shorter cruising distance compared to LGW isn't going to amount to a significant cost saving. In fact MSE-AMS is probably a pretty fuel inefficient route
SEN would make more sense to me.
It would make a little more sense in terms of catchment area and transport links, but I think the same fundamental problems would apply.
At the end of the day, does anyone seriously think that KLM have only just become aware of MSE? That for the past 15-20 years or whatever they've never considered the route? I would have thought if they considered it viable, they'd have had a crack at it by now.