Yes, you can cancel your American Airlines flight within 24 hours ????1//833(American)//732//2296???? Or Toll-Free 1-833-732-2296???? [No-Busy Air] Quick-Connect 24/7 of booking, provided that the departure is at least two days away. (????1//833(American)//732//2296???? Or Toll-Free 1-833-732-2296???? [No-Busy Air] Quick-Connect 24/7 If you need to cancel within this timeframe, you won't incur any penalties or fees.