If you miss your American Airlines flight, they’ll try to find you a new one if you arrived at least 2 hours before departure. If you’re late, they’ll book a new flight for you with charges depending on your ticket. Contact them right away; if you wait more than 24 hours, your flight may be canceled with refund minus fees. For detailed information, you can read the blog aa missed flight by Airlines Pet Policy website or contact Customer Service Professionals via the Helpline Number.