Delta Air Lines, Inc. DAL delivered a jolt of optimism to Wall Street Thursday, as its stock surged 12% after the company reported better-than-expected second-quarter earnings and reinstated its full-year profit outlook. The rally led airline stocks higher across the board with investor confidence returning to the sector. The Details: Delta reported adjusted earnings of $2.10 per share, topping expectations of $2.05. Passenger revenue surged 26% to $13.88 billion and operating revenue for the quarter was $1 ...