Air travel has become a casualty of economic warfare between the United States and Iran, as jet fuel prices have doubled and remain elevated. United Airlines plans to reduce its scheduled flights by 5% and return to its normal schedule by fall. Delta Air Lines expects to spend an additional $2 billion on fuel over April, May and June, cutting 3.5% of its flights to manage costs. Air Canada also announced it would reduce routes impacted by rising fuel prices, including those from Salt Lake City to Toronto and New York's John F. Kennedy International Airport to both Toronto and Montreal. Lufthansa Group will remove 20,000 flights from its carrier group's schedules through October, a move that will save 40,000 metric tons of jet fuel.