When requesting a reward using the AC reward chart (not the NZ reward chart that AC also has), the 'D' class inventory (thanks for the reminder, Empress), if the flight is operated by AC, will only come from the AC flight number inventory. Any space that NZ may have on the AC operated flight is for NZ use only. AC cannot take reward inventory from their allotment, even if there is 'I' class. This is to be used by NZ only.