Originally Posted by
yohanson
I can't comment on the full Y ticket upgrade availability but I assume that a full Y fare will nearly always be cheaper than the discounted F fares that Delta offers within the "FCM window".
No such thing as an "FCM Window"... First Class Monetization is the process of squeezing as much revenue as possible out of the FC cabin utilizing revenue management techniques that match supply and demand as closely as possible. FCM exists from the moment a flight opens for sale right up until the time the doors close.