At 8:21, American 11 turned off its transponder, immediately degrading the information available about the aircraft.
( ( At 8:21 ) ( , ( ( American 11 ) ( ( ( ( ( turned off ) ( its transponder ) ) , ) ( immediately ( degrading ( ( the information ) ( available ( about ( the aircraft ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 8:21))) (, ,) (NP (NNP American) (CD 11)) (VP (VBD turned) (PRT (RP off)) (NP (PRP$ its) (NN transponder)) (, ,) (S (ADVP (RB immediately)) (VP (VBG degrading) (S (NP (DT the) (NN information)) (ADJP (JJ available) (PP (IN about) (NP (DT the) (NN aircraft)))))))) (. .)))
American 11 turned off its transponder at 8:21 AM immediately degrading any available information about the location or wellbeing of the aircraft.
( ( American 11 ) ( ( ( ( turned off ) ( its transponder ) ) ( at ( ( 8:21 AM ) ( ( ( immediately ( degrading ( ( any ( available information ) ) ( about ( the location ) ) ) ) ) or ) ( wellbeing ( of ( the aircraft ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP American) (CD 11)) (VP (VBD turned) (PRT (RP off)) (NP (PRP$ its) (NN transponder)) (PP (IN at) (S (NP (NNP 8:21) (VBP AM)) (VP (VP (ADVP (RB immediately)) (VBG degrading) (NP (NP (DT any) (JJ available) (NN information)) (PP (IN about) (NP (DT the) (NN location))))) (CC or) (VP (VBG wellbeing) (PP (IN of) (NP (DT the) (NN aircraft)))))))) (. .)))