Originally Posted by
Xandrios
They would have to. That's part of the fare (rules) that you booked - or at least normally for paid tickets it is.
For award tickets, it can get thorny: some airlines will/have let you cancel the award ticket for free but charge you a fee for redepositing the miles. DL pre pandemic was an example of that (the fee was waived for elites; theoretically it still applies to ex-Asia DL awards though the DL agents generally don't collect it).
Don't know if that's how FB does it, but it's a possibility.