Originally Posted by
f0zzyNUE
upgrades have nothing to do with promo award booking space (I-class). J-class (deep discount business class) must be available in order to be able to process an upgrade. 24 hours prior to your flight you can upgrade as long as a business class seat is available (no restrictions on available business class booking classes)
Aren't those rules for voucher upgrades? That's not what I'm looking for.
I'm seeking for miles upgrade. But if you're right, it's kinda strange I can pay 35k miles + taxes to book business flight, but I can't pay taxes + economy class fare + 35k miles for the same routing?