The following are the steps to upgrade a flight seat on Alaska Airlines: 

• Go to the airline's official website and search for the "manage reservations" option.

• After that, choose the seat upgrade tab from the list of choices and continue.

• If necessary, you can input your booking number and additional flight information.

• If your flight permits seat upgrades, proceed to the online procedures and select one of your preferred seats by Alaska Airlines First class Upgrade.

• You can choose between paying with miles or with cash. And after that, upgrading your flying seat is simple.

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