Korean Air has come up with a new fee, a penalty for not using an already paid-for ticket. That's on top of losing the money paid for the ticket.
Passengers often abandon tickets when the change fee is too high (with change fees at around $200, that happens often on U.S. domestic flights). Korean Air wants to resell the seat you paid for, and it's using the fee or the fear of it to force passengers to notify them.
The fee is $120 on long-haul flights, $70 for medium haul and for short flights $50. For tickets bought with award miles, there are penalties of 12, 7 or 5 thousand miles.
Let's hope this one goes no further!