Originally Posted by yvr76

Well they're technically honouring your original fare - Economy + preferred seat, but just not a PY seat.

Seems that they need to split out E and N class requirements to J. i.e. for YVR - YYZ (1500+ miles)

E -> J : 8 credits
N -> J : 4 credits
O -> J : 2 credits

Maybe one more fare class is needed to accommodate this.

Bizarre that M -> J is 4 credits and E/N -> J is 8 credits!