The new rule mandates that refunds are automatically processed by an airline if a passenger's flight is "canceled or significantly changed, and they do not accept the significantly changed flight, rebooking on an alternative flight, or alternative compensation."

Airlines in the United States are now required to give passengers cash refunds if their flight is significantly delayed or canceled, even if that person does not explicitly ask for a refund.

The Department of Transportation says the final federal rule requiring that airlines dole out refunds - not vouchers - went into effect Monday. The major change is being implemented only a month before the start of what is likely to be a huge holiday travel season.

Transportation Secretary Pete Buttigieg made the announcement on X after he first presented the proposed rule back in April. “Today, our automatic refund rule goes into full effect,” Buttigieg posted. “Passengers deserve to get their money back when an airline owes them-without headaches or haggling.”