What to do if you miss the flight with American Airlines?

If a situation like this arises, then here are the points given:

The passengers can rebook the same flight 15 min before or after the departure.

If you rebook the flight late, it'll be a no-show condition.

However, passengers can fly on the same new flight if they make it to the airport on time. But if you still miss the carrier, there'll be no charges.

If the airline cancels or delays the flight, the commuters can travel on the next available flight without extra charges.

Now, while reporting to the airport late upto 2 hrs before the flight departure, you'll make a reservation on the new flight without any fee.
Source: https://bresdel.com/blogs/277637/American-Missed-Flight-Overview https://cancellationflights.com/blog/american-airlines-missed-flight-policy/