Old Feb 3, 11, 3:10 pm
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The 240/80 AA page link to in the OP has been updated (indicates January 12, 2011). However, the ranges are listed as 0-60, 61-120, 121+:

Schedule Change unacceptable to customer

... The customer may be eligible for a refund by AA only for the unused portion of the ticket.
  • If schedule change is from a nonstop to a connection or through flight , a refund to form of payment (FOP) is allowed by American Airlines.
  • If schedule change is from a through flight to a connecting flight, NO refund.
    • EXCEPTION: see C and D and E below.
  • If schedule change or flight delay of 60 minutes or less NOT eligible for a refund.
  • If schedule change is 61-120 minutes, refund to voucher only is allowed by American Airlines.
  • If schedule change is greater than 120 minutes, refund of the remaining ticket to the original form of payment (FOP). All remaining coupons must be refunded by American Airlines.
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