Delta reported fourth-quarter earnings that topped analyst expectations on Friday. Revenue from premium seats was a major bright spot for the airline. Shares soared more than 9% in trading following the announcement.People are clamoring for premium air travel, and Delta Air Lines is cashing in on that demand.AD The airline reported fourth-quarter earnings and revenue on Friday, both of which beat Wall Street estimates. Massive growth in premium seat sales helped send shares up more than 9% in trading Frida ...