That's quite useful. Wish there was another post with the long-haul fare classes, and both of them were assembled in a sticky. </hint>
Longhaul routes are set up by KLM in a more complex way which can't be broken down so easily.
It is largely market based. Add in the fact that NW look after all KL fares in North America and you will soon see the complexity.
If you also consider that fares on longhaul routes are a lot more dynamic according to the period, stay length and additional various factors.