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There are two ways in which you can upgrade the flight tickets. One is if you are a regular Air Astana airlines traveller, then you can just use your mileage that's stored and get your flight tickets upgraded. The next is when you open your registered email id just before the flight, you might get a surprise because an upgrade also happens then, and the aviation company sends some complimentary upgrades to the passengers in the email. You can use the code and get your flight tickets upgraded. This way how you upgrade your seat after purchase.