Somewhat surprised that my card worked for a small in flight purchase at 50,000 feet. Receipt says that the transaction was keyed. It wasn’t contactless and I wasn’t asked for a PIN. Receipt clearly shows too that the card is non-personalised.
Not a problem for me but despite writing this using in flight WiFi the transaction was clearly off line and presumably potentially subject to charge back. It will be interesting to see when this transaction comes through.
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Monzo cards shouldn’t work offline but still do in rare instances - flights with some airlines being on of them.