One of the things I love about flying Skywest, a regional carrier in the Western U.S. for both United and Delta, is that they’ve long served Biscoff cookies.
The Gourmet Center in San Francisco (which sells these wonderful treats) is now offering one Delta mile per dollar spent at their online store, plus 250 miles for each order (500 miles on orders of $75 or more).
This isn’t the most lucrative offer on its own terms, but for folks like me who have long considered ordering the cookies anyway this gives me a pretty good excuse.