That didn’t take long, we now have our first devaluation for 2021 (although apparently these changes occurred on December 31, 2020). Virgin Atlantic has devalued some sweet spots on Delta partner awards with no notice. Virgin Atlantic now uses a new distance based award chart for Delta redemptions. The biggest impact seems to be on Delta business class awards which in some cases have more than doubled in price. The old award chart is here (round trip prices):
The new award chart is here (one way):
Hat tip to Thrifty Traveler (who also has some good comparisons between the old and new charts)