Originally Posted by
MSPeconomist
The OP is asking that DL give the last available business class seat to a PM who was upgraded. To me, it would make sense to give the few available business class seats for rebooking either to DMs or to those who have paid for business class. An upgraded PM should receive lower priority during IROPs.
MSP I have absolutely seen you argue in this forum that miles are a form of payment. OP's friend stopped being a confirmed coach pax and became a confirmed J pax when the miles were spent to upgrade the ticket.