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1. You can also check the authenticity of the ticket by logging in to the China TravelSky website at If you have used the e-ticket, you can verify it within 27 days of use on all segments of the ticket. If the electronic ticket is not used, verification can be provided within one year from the date that the ticket is purchased.3. We can only verify the authenticity of the ticket and we cannot check the validity of the ticket. Thank you for your understanding.