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This is very normal in Australia. All the major airlines do it via POLi[1]

I wouldn't say it is common - I've never seen it.

It's usually the only option to avoid a $5-$70 credit card surcharge. Have you ever paid for a flight online with Jetstar, Tiger or Air Asia?

With Jetstar, up until a few months ago, you could do your own bank transfer, but now poli is the only option.

Tiger used to not charge for Mastercard debit. It has changed recently, but still only a matter of cents.