Delta Air Lines has hired a consultant to assess the impact on jet fuel prices if the carrier sells or closes the Philadelphia-area refinery it purchased five years ago to keep fuel affordable, two sources familiar with the process said. They said the consultant will also study other scenarios involving jet fuel prices and the refinery sector, including the impact if other refineries close. The U.S. East Coast refining industry is fighting a battle to survive, with concerns about a second wave of plant closures after four refineries shuttered in the past decade due to the rising costs of acquiring crude. Dallas-based consultancy Baker & O’Brien Inc was asked to perform a financial valuation of the refinery’s assets and study other scenarios, such as other regional refineries closing and the financial impact […]