Passenger numbers on all routes increased when the F50 got the bullet.
KLM is in a completely different market to the locos.
Flight connections through Amsterdam in any case are often cheaper than a loco Amsterdam return.
Check out the fares on the KLM uk booking site.
LBA Madrid £56 return. Warsaw £69. Barcelona also a few peanuts,I assume HUY is the same.
These fares have been around all through the year.
The flights always seem to be quite full at LBA and I believe HUY is the same. Most of the UK flights are F70/100 including NCL.
Why would they want to use bigger aircraft from an unknown airport like DSA? OH, of course! the big runway!!!!