    Senténée -1: It. also hiréd Citigroup ~ and  Morgan .Stanley. to. exptore ‘refinancing. or  restructuring ‘of $ 175 million in, senior  notes due next. year .    Sentence 2: ATA-also ‘has: hired Citigroup ond  Morgan ‘Stanley, td” eudluate options” for  refinancing. or réstructuring $ 175 million of  10.5 peréent -senior -riotes .due in August. 2004.