GOOD DAY FOR: Airline dominoes, after regional U.S. discount carrier Frontier Airlines became at least the fourth airline to declare bankruptcy in the past two weeks. Frontier said the move was prompted by its credit-card processor, who unexpectedly threatened to withhold significant portions of ticket sales. The airline plans to operate normally under bankruptcy. (Bloomberg in the Denver Post)

BAD DAY FOR: Lax culture standards, after L.A.-based frozen dessert maker Pinkberry settled a lawsuit alleging that it incorrectly labeled its frozen treats as yogurt. Pinkberry said it really does make frozen yogurt, cultures and all, but conceded that it wasn’t complying with a state guideline requiring yogurt to be mixed off-site. It agreed to donate $750,000 to charity. (Los Angeles Times, free registration)