Originally Posted by
kiam
Paid upgrade from original "eligible-to-earn-miles" booking class will give you the mileage in the new (upgraded) class. So for your case, paid upgrade from M to Biz no doubt earns miles in Biz class.
I guess that it depends on wich FF program you are posting your miles to. I know that on SAS Eurobonus you will only be given points according to the original class of travel!
BFN
