Delta Air Lines and Southwest Airlines have increased their checked bag fees by $10, a move that each airline is making passengers on new bookings pay $10 more per bag than usual. The changes only apply to domestic and short-haul international tickets purchased for these increases. The first checked bag at Southwest will now cost $45, and the second will cost $55. Those who want to check a third bag on a Delta flight must pay $200. United Airlines and JetBlue Airways also increased their general bag fees. Fuel costs have risen significantly due to ongoing conflict between the United States and Israel in recent weeks.