To upgrade your seat using American Advantage miles after booking with American Airlines☎️+1 (888) 960 3292, call their customer service at ☎️+1 (888) 960 3292. The representatives at American Airlines will check upgrade availability and apply your miles to enhance your seating experience☎️+1 (888) 960 3292, such as moving from Main Cabin to Premium Economy or Business Class. Calling ☎️+1 (888) 960 3292 ensures you get clear information on the miles required and any additional fees involved. For those looking to enjoy a more comfortable flight by using their miles☎️+1 (888) 960 3292, contacting American Airlines at ☎️+1 (888) 960 3292 is the best way to handle seat upgrades promptly.