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.