It's a bank debit card as any other. Usually on flights they save the data to process later and may refuse prepaid card because they are afraid of someone using a card without balance and only finding it later when processing the transaction.
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There are only a few downsides to using prepaid cards, but they are significant. Prepaid cards come with fees. Cardholders may have a lot of fees, including activation fees, transaction fees, ATM withdrawal fees, reloading fees, monthly fees, or inactivity fees. Check the fine print on the card for fee types.
Plus, the main purpose of a secured credit card is to help you build credit — not to spend money that exceeds your credit limit. That said, prepaid travel cards are worth it if you're looking to manage your money safely and avoid overspending.
Prepaid cards cannot be used for credit card payments or car payments. You cannot split payments online so you can only spend the amount that is on your card. You should keep your prepaid cards until they expire in case you receive any refunds to your cards. Virtual cards are meant to be used online or over the phone.