At 9:41, Cleveland Center lost United 93's transponder signal.
( ( At 9:41 ) ( , ( ( Cleveland Center ) ( ( lost ( ( United ( 93 's ) ) ( transponder signal ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 9:41))) (, ,) (NP (NNP Cleveland) (NNP Center)) (VP (VBD lost) (NP (NP (NNP United) (CD 93) (POS 's)) (NN transponder) (NN signal))) (. .)))
The signal from United 93's transponder was lost.
( ( ( The signal ) ( from ( ( United ( 93 's ) ) transponder ) ) ) ( ( was lost ) . ) )
(ROOT (S (NP (NP (DT The) (NN signal)) (PP (IN from) (NP (NP (NNP United) (CD 93) (POS 's)) (NN transponder)))) (VP (VBD was) (VP (VBN lost))) (. .)))