Hi all- This is a bit new to me. Delta Platinum and I have four system-wide upgrades. Going to Israel next May and was planning on using a British Airways companion ticket for Business or First but this popped up and seemed promising. From what I read on The Points Guy today, SWUs can be used for Fare Classes Y B M H Q K. Looking at ExpertFlyer for the dates we want (and dates a day before and after), they report that there are more than 9 K class tickets available on the non-stops. Great. Then look at the ExpertFlyer fare info and it says that the K fare is $789 - less than the BA charges! Called Delta to see if we can do this and was told the lowest upgradable fare was over $3,000 per ticket. What am I doing wrong or what don't I know. I decided to politely hang up and try to get info from this board. Hope someone can help. Thanks.