Originally Posted by
RealHJ
It's easy to get it. Just go to delta.com, search for any int'l award ticket, before booking click on the fare rules link, copy and paste and save the BLACKOUT DATES section.
That's a
very useful hint. It presumes that Delta has loaded general blackout dates for all ~25 redemption partners to its general ticket rules even though most can't be booked online for awards. How broadly have you tested this?