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 Cleveland Center still had the signal from the transponder.
( ( The ( Cleveland Center ) ) ( still ( ( had ( ( the signal ) ( from ( the transponder ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NNP Cleveland) (NNP Center)) (ADVP (RB still)) (VP (VBD had) (NP (NP (DT the) (NN signal)) (PP (IN from) (NP (DT the) (NN transponder))))) (. .)))