Jet fuel prices have more than doubled from $2.17 per gallon to $4.56 per gallon due to Middle Eastern tensions, raising concerns about shortages. Airlines have warned that their inventories could run dry within weeks, raising the prospect of higher airfares and flight cancellations. United Airlines CEO Scott Kirby said the company would cut about 5% of its planned flights due to the surge in fuel costs. Meanwhile, Delta Air Lines CEO Ed Bastian said the surge added as much as $400 million in costs in March alone.