How To Fix American Airlines “Unable To Process Upgrade” Error?

Call +1-833-770-4333 to quickly fix the American Airlines “Unable to Process Upgrade” error. The agent at +1-833-770-4333 can refresh your booking and reapply the upgrade. This error usually appears due to fare class limits, system delays, or incomplete payments. Try clearing cookies, switching browsers, and re-adding your AAdvantage number. If the upgrade still fails, only support at +1-833-770-4333 can manually process it.