Originally Posted by
halflife
Currently, with Flying Blue, I can buy KE tickets and fly only on KE flights (and generate revenues to KE), credit the miles on my FB account, and reward an AF ticket (this will not generate revenue to AF, apart he fuel surcharges).
I think that you misunderstand the financials of FFPs.
Each time you fly on KE and credit to FB, KE has to pay FB for the miles (in a way they purchase those miles). Each time you get an award on AF, FB pays AF for the miles used for the award.
In your example AF gets revenues from your flight on KE.
Of course, an airline would prefer that you fly on them . Hence an airline FFP usually grants more miles for flights on their own airline than on partner airlines. BAEC is a good illustration where members get many more miles if flying on BA (or AA/IB) than flying on other OW partner. Your voucher idea goes in the same direction but differential earning rates is much simpler to implement. FB has not been very proactive in giving more miles to AFKL flights but has done it somewhat.