Do airline tickets or hotels have to be fulfilled as long as they are marked non-refundable?

This is indeed the case at present. I think I should be clear when I booked the special ticket, so there is controversy about this. If negotiation fails, you can bring a lawsuit to the court. At present, the law does not clearly stipulate this, or you can claim your rights from the perspective of overlord clause. However, it is unpredictable whether this right will be supported by the court.