It's too early to tell how CO/NW/DL will streamline the upgrade part of their FF programs in the coming months.

As a CO Platinum, I hope they will keep the complimentary upgrades on CO/NW. However my gut feeling tells me this benefit may be on the wane as CO/NW becomes part of the "SKY TEAM". SKY TEAM is DL's turf and I doubt that DL will allow CO/NW to siphon off its members with the free upgrade policy that DL certainly does not offer.

I hope I'm wrong on this matter.