They try to get a refund on it after the flight has taken off—maybe three, four, five days later, maybe a week later—and they look at the ticket and it says “No refunds allowed on this ticket”, and they might believe it.
Ensuite, quelques jours après la date du vol—mettons trois, quatre ou cinq jours, ou une semaine plus tard—elle tombe sur le billet et lit: «Billet non remboursable», et le croit.