My recollection is the PMUA 763s as with virtually all their AC had nozzles. I wonder if the converted 763s had them Smiseked away?
This is a legit issue in sweltering Asia right now, where my NH 789 and SQ 78J flights do not offer this option. Brand new aircraft at that.
One of numerous subtle advantages UA has that gets drowned out in the whinges about food.