By Grace Lieberman From The Dallas Morning News American Airlines plans to cancel voluntary leaves taken by its flight attendants in November, December and January, as it anticipates an uptick in holiday travel will create a need for extra staffing. According to a letter from the Association of Professional Flight Attendants to its 28,000 members, it’s unclear how many leaves will be canceled. Under a July 2020 agreement between the Fort Worth-based airline and the union, the carrier can cancel or reduce leaves with at least 60 days notice if a need for more flight attendants arises. Voluntary leaves were one of the steps American Airlines took last year to slow its losses as the COVID-19 pandemic decimated the air travel industry. The airline offered pilots voluntary leaves ranging from a month to six months and up to a year for flight attendants. Both groups were also offered early retirement …