Major airlines including Delta, United and American could face higher fuel costs if U.S. regulators allow Colonial Pipeline Co to stop shipping a dirtier blend of jet fuel by 2018. The Colonial system carries most of the jet fuel that is delivered via pipeline to the East Coast and used by busy airports serving New York, Washington, D.C. and Atlanta, along with U.S. military bases. The pipeline company said earlier this month it would ask the Federal Energy Regulatory Commission for permission to halt shipments of high-sulfur jet fuel and diesel. Preliminary estimates indicate that jet fuel prices could rise significantly if Colonial wins approval, said John Heimlich, chief economist for the industry trade group Airlines for America (A4A). Rising fuel prices could make certain flights unprofitable, forcing airlines to cut service and sell fewer seats – likely at higher prices. It would take jet fuel price increases of […]