I just flew MSY-MEM-MCO on NWA as a Platinum and was upgraded but I have no way of knowing if there were Silvers in the cabin. I would take into account time of flight and if it is a holiday time of year. I was very glad my upgrade cleared because the back of the bus was full of Disney bound kiddies.

The flight was nice but nothing special. We did get a meal MEM-MCO which suprised me.