At 9:32, a hijacker, probably Jarrah, made or attempted to make the following announcement to the passengers of Flight 93:Ladies and  Here the captain, please sit down keep remaining sitting.
( ( At 9:32 ) ( , ( ( ( a hijacker ) ( , ( probably ( Jarrah , ) ) ) ) ( ( ( ( ( made or ) ( attempted ( to ( ( make ( the ( following announcement ) ) ) ( to ( ( ( ( the passengers ) ( of ( Flight 93 ) ) ) : ) ( ( ( Ladies and ) Here ) ( the captain ) ) ) ) ) ) ) ) ( , please ) ) ( ( sit down ) ( keep ( remaining sitting ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 9:32))) (, ,) (NP (NP (DT a) (NN hijacker)) (PRN (, ,) (ADVP (RB probably)) (NP (NNP Jarrah)) (, ,))) (VP (VP (VBD made)) (CC or) (VP (VBD attempted) (S (VP (TO to) (VP (VB make) (NP (DT the) (JJ following) (NN announcement)) (PP (TO to) (NP (NP (NP (DT the) (NNS passengers)) (PP (IN of) (NP (NNP Flight) (CD 93)))) (: :) (NP (NP (NNP Ladies)) (CC and) (ADVP (RB Here)) (NP (DT the) (NN captain))))))))) (PRN (, ,) (INTJ (VB please))) (VP (VBP sit) (PRT (RP down)) (S (VP (VB keep) (NP (NP (VBG remaining)) (VP (VBG sitting))))))) (. .)))
Jarrah, the probable hijacker, attempted to instruct the passengers of flight 93 to sit down and remain seated.
( ( ( ( Jarrah , ) ( the ( probable hijacker ) ) ) , ) ( ( attempted ( to ( ( instruct ( ( the passengers ) ( of ( flight 93 ) ) ) ) ( to ( ( ( sit down ) and ) ( remain seated ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Jarrah)) (, ,) (NP (DT the) (JJ probable) (NN hijacker)) (, ,)) (VP (VBD attempted) (S (VP (TO to) (VP (VB instruct) (NP (NP (DT the) (NNS passengers)) (PP (IN of) (NP (NN flight) (CD 93)))) (S (VP (TO to) (VP (VP (VB sit) (PRT (RP down))) (CC and) (VP (VB remain) (VP (VBN seated)))))))))) (. .)))