For anyone sore about Delta’s takover of Northwest Airlines (and count me among you—seriously, Delta couldn’t hold the last plane of the night for one minute in Atlanta on a day when it canceled flights left and right, then made me pay for my own hotel room?), here’s a redeeming point: if you chose the American Express Delta Skymiles credit card when your Worldperks Visa went away, you have a few just-announced perks. Flashing the card at the Walker Art Center or the Mill City Museum gets you two-for-one admission for up to four tickets. And you’ll get 20 percent off tickets to the Guthrie Theater. The promotion runs through June of next year.