I recently purchased a ticket with China Eastern Airlines, but I quickly discovered that I needed to alter my itinerary. Fortunately, I was reminded of China Eastern Airlines 24 hours Cancellation policy, which permits customers to change their reservations up to 24 hours after making a purchase without being charged extra. When I called their customer support team right away to make sure I qualified, they told me I could cancel as long as I did it within the allotted 24-hour period.