NEW YORK (Standard&Poor's CreditWire) Aug. 1, 2000--Standard&Poor's has assigned its triple-'B'-minus rating to the $405 million Dallas-Fort Worth International Airport Facility Improvement Corp., American Airlines Inc. revenue refunding bonds, series 2000 (see details below). The bonds, which will refinance existing debt issued in 1990, are guaranteed by American Airlines Inc. (BBB-/Negative/A-3). The facilities financed by the 1990 issue and now being refinanced include terminal expansions and renovations, construction of an aircraft hangar, and expansion and renovation of training facilities at American's principal hub, Dallas-Fort Worth International Airport. Ratings on AMR Corp. and unit American Airlines are supported by the airline's strong competitive position, with solid revenue and cash flow generation, one of the industry's better balance