To get Premium Economy on American Airlines, start by booking a fare that includes it or one that’s upgrade-eligible (basic economy usually isn’t). After you’ve booked, check your reservation online or in the app to see if Premium Economy seats are available. You can move up by using AAdvantage miles, paying a cash upgrade fee, or using upgrade certificates if you have them. If space isn’t available when you try, you may be put on a waitlist and cleared later. Higher elite status and flexibility with travel dates help increase your chances of upgrading.