I’ve upgraded flights on American Airlines a few different ways over the years, mostly after learning the hard way during a tight travel schedule. On one trip, I booked basic economy and later realized I needed more comfort and flexibility. I called 844-734-0813, and the agent explained all my options—using miles, paying for a cash upgrade, checking Main Cabin Extra availability, or even rebooking into a higher fare class. They helped me switch flights and secure a better seat in one call. Since then, I’ve found that calling is the fastest way to understand upgrade possibilities, especially when plans change or seats start filling up quickly.