NY -- Standard&Poor's CreditWire 8/9/96 -- Standard&Poor's today has affirmed its ratings of AMR Corp. and unit American Airlines Inc. (see table below), following AMR's announcement that it plans to sell 20% of its computerized reservation system unit, The SABRE Group, in an initial public offering (IPO). The rating outlook remains positive. About $6.7 billion of securities is affected. The SABRE Group earned a pretax profit of $195 million, on revenues of $838 million (over a third from affiliate American Airlines) in the first half of 1996. While the revenues are less than 10% of AMR's consolidated total, pretax income represents a material portion of the $745 million reported by AMR in that period. An eventual