NEW YORK (Standard&Poor's) Jan. 17, 2002-- AMR Corp. (BB/Watch Neg/B), parent of American Airlines Inc. (BB/Watch Neg/B), as expected, reported a substantial fourth-quarter 2001 net loss ($734 million before federal cash grants and other special items; $798 million including such items). Standard&Poor's ratings for both entities remain on CreditWatch with negative implications, where they were placed Sept. 13, 2001 (along with those of other rated U.S. airlines). The fourth-quarter loss brought AMR's full-year deficit to $1.4 billion before special items ($1.8 billion after such items). However, as at other U.S. airlines, revenue generation is gradually improving from a post-Sept. 11, 2001, low point. AMR's daily cash operating loss, which averaged $8.5 million to $9 million during