China Air Confirmation

If you have reserved a seat to continue your flight in China, or for a return journey on an international or regional flight, you should reconfirm your reservation at least 72 hours before departure if you'll stop over at the boarding place for longer than 72 hours. If you fail to reconfirm, the seat shall be automatically cancelled. No confirmation is necessary if you stop over at the place for your continued flight or return flight for less than 72 hours.

China Air Ticket Validity

Normal fare tickets, whether for single, return or circular trips, are valid for one year. The validity periods of special fare tickets and discount normal fare tickets are calculated on the basis of related fares in accordance with relevant stipulations.