Delta recently changed earnings on Starbucks purchases and I think its good news. Starting August 5th, you’ll earn 1 Delta Kkymile for each dollar spent at Starbucks as long as you’ve taken a Delta flight within the past 12 months. Previously, you only earned Skymiles on Starbucks reloads. Double stars will still be earned on Delta travel days.
More information about the changes can be found here