TWA <TWA> DECLINES COMMENT ON USAIR <U> A Transworld Airlines Inc official said the airline has no comment on USAir Group Inc's planned buyout of Piedmont Aviation Inc. TWA, however, has pursued its application with the Department of Transportation for a takeover of USAir, according to Mark Buckstein, TWA general counsel and vice president. TWA filed a revised application today, following the DOT's rejection Friday of an incomplete application filed last week. Earlier USAir said it agreed to buy Piedmont for 69 dlrs cash per share.