Originally Posted by
mtkeller
It has everything to do with inventory: V inventory for upgrades. You're right that there's not a ton of correlation with F or Y inventory, but the timing of upgrade processing has everything to do with if/when DL makes V inventory available for upgrades.
My personnal experiences and that of my collegues contradicts this.
We put an average of 200K per year on Delta, each of us, and I can tell you for a fact that timing is all over the place.
I have had Y class tickets clear as late as the day of the flight, and as early as the time I booked.
What the Delta Rules say, and what happens in reality are very different.
I can also tell you that things were much much more consistent with the rules back in 2009 and 2010.
It seems that this type of "messed up" upgrading is happening more frequently in 2011.