NEW YORK (Standard&Poor's) April 15, 2003-- Standard&Poor's Ratings Services said that its 'CCC' corporate credit ratings on American Airlines Inc. and on its parent company, AMR Corp., remain on CreditWatch with developing implications. American said that its pilots and two labor groups represented by the Transport Workers Union had approved concessionary contracts, while the flight attendants narrowly rejected their proposed contract but will be permitted to cast new ballots through 5PM CDT April 16, 2003. "The inconclusive results of American's labor votes leaves the airline's future still in doubt, but the precedent of pilots and ground employees approving their concessions may swing enough votes to change the flight attendants' outcome in a supplemental vote," said Standard