Some people wait until the end of the year to use the airline travel credits that several premium credit cards offer.
For instance, one passenger decided on December 31 that the only thing they could do with the remainder of their $200 American Express Platinum credit would be to buy $150 worth of alcohol on a flight. Apparently they wanted to buy the booze for themselves to take home, which isn’t ok. They would have been better off buying drinks for the plane. I prefer to use my fee credits right away.