Delta Air Lines Inc is running its Philadelphia area oil refinery at a near-record 110 percent of capacity, according to a person familiar with operations, a sign of the surprisingly strong summer profits U.S. refineries are generating. While collapsing global crude oil markets have cast a dark shadow over much of the energy industry, refiners are running flat out this summer to meet record U.S. demand for gasoline. Some have pressed beyond their theoretical limits as rivals suffered unexpected breakdowns or glitches last month. The refinery, in Trainer, Pennsylvania, has been running at a clip of roughly 204,000 barrels per day for the past month, the source said, resulting in higher yields of gasoline and distillates. The plant’s nameplate capacity is 185,000 bpd, according to the U.S. Energy Information Administration. “We have run that before, but not in a very long time,” the source said. The refinery is operated […]