A canceled flight can turn a simple trip into a maze of phone calls, vouchers, and unexpected bills. But some of the rules are more travel-friendly than many passengers realize. A significant delay can mean a cash refund, not just airline credit. An airline-caused three-hour delay may come with a meal voucher, and a bag that vanishes for 12 hours can trigger a baggage fee refund. Here are 10 passenger protections worth knowing before the next airport surprise.