NEW YORK (Standard&Poor's CreditWire) March 12, 2001-- Standard&Poor's ratings on AMR Corp. and unit American Airlines Inc. (see table below) remain on CreditWatch with negative implications following approval from the Trans World Airlines Inc. (TWA; D/—) bankruptcy court judge for AMR's proposed acquisition of substantially all TWA assets. The judge's decision can still be appealed by other parties over the next 10 days, and the U.S. Department of Justice could block it, but neither of these is seen as likely. The bankruptcy court has scheduled a hearing for April 6, at which time AMR hopes to finalize the acquisition. The acquisition provides American with a geographically well-placed hub in St. Louis, 175 airport gates (about half