If you have lost your Air China boarding pass and you wish to reclaim your mileage, you can do so by following these steps:
First, you need to contact the Air China customer service center immediately, inform them of the loss of your boarding pass, and ask them to recalculate your mileage for you. When providing this information, you will need to provide your name, ticket number and relevant flight information.
Secondly, you will need to provide some supporting documents to prove that you have completed the relevant flight before you lose your boarding pass. This may include copies of airline tickets, itinerary receipts, airport security documents, etc. These documents can help Air China confirm your mileage eligibility and quantity.
Finally, you will need to fill out an Air China mileage claim request form, which can be obtained on the official Air China website or from the Air China Customer Service Center. When filling out the application form, you will need to provide your personal information and relevant flight information and sign to confirm the request.
After completing the above steps, Air China will review your application and recalculate the mileage for you. Please note that this process may take some time, depending on the processing speed of Air China.
In order to avoid similar situations from happening again, it is recommended that you keep your boarding pass and other relevant documents safe when traveling. If you lose your boarding pass and other documents, please contact the Air China Customer Service Center immediately and follow their instructions.