Originally Posted by businessextra.com
AAdvantage Platinum® appointments issued January 1st through August 30th of each year are valid through March 31st of the following year (i.e. Mar. 31, 2023).
AAdvantage Platinum® appointments issued September 1st through December 31st of each year are valid through March 31st of the next calendar year (i.e. Mar. 31, 2024).