The Lion Air website warns that it reserves the right to cancel your booking if, at check-in you do not present the credit card that was used to book the flight. Six weeks ago, from Australia, I booked a flight, Bali-Lombok, for my wife on my card. I duly received a bank statement indicating that the transaction had been processed and assumed, that being the case, there was no need for my wife to take the card with her to Indonesia. (I was going to photo copy the card buy forgot to). You know what's going to happen next don't you? Yes, check demands to see the card. Luckily, my wife was able to contact me immediately and I was able to SMS her the card number. I am mystified as to why Lion Air's website makes this demand and can't imagine they would actually carry through with the threat to refuse a person permission to board. I will contact them and see if I can find out. In the meantime be warned and don't get caught out.