    Sentence i: United -Airlines :plans ‘to becoime::the.  flist ‘domestic -alrline ‘to offer :¢-mail: oi’ all. its  domestic’ flights -by.the end of.‘the. year , the  comipany announced yesterday    Sentence 2: United Airways plans’ to offer ‘in.  flight. ,- two-way. “e-mail on. all dotnestic flights  by. thé end of the. year’, pee the first US.;  éarrier to do so -