ATLANTA AP – Delta Air Lines Inc., the world’s biggest airline operator, on Wednesday reported a double-digit drop in unit revenue during the second quarter as demand for air travel continued to slump, but it narrowed its net loss to $257 million from a year earlier when it accounted for big one-time items.

The news followed hefty losses reported by Continental Airlines Inc. and American Airlines parent AMR Corp., while United Airlines parent UAL Corp. posted a small profit. Discount carriers Southwest Airlines Co. and the parent of AirTran Airways also had profits.