As per the American flight cancellation fee, American won't permit you to cancel an essential economy ticket except if it is canceled inside the period of 24 hours from the time it was paid for. But there are some exceptional cases, such as military order, if someone traveling with you suddenly dies, or demise in your family or Airline itself cancel the flight due to any advanced circumstances then in this situation, it will allow you to acquire your refund but essential official paper related with the cause will need to be submitted.