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))))))) (. .)))
A hijacker, but not Jarrah, taunted the passengers of Flights 93 over the intercom.
( ( ( ( ( ( A hijacker ) , ) ( but not ) ) Jarrah ) , ) ( ( ( taunted ( ( the passengers ) ( of ( Flights 93 ) ) ) ) ( over ( the intercom ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN hijacker)) (, ,) (CONJP (CC but) (RB not)) (NP (NNP Jarrah)) (, ,)) (VP (VBD taunted) (NP (NP (DT the) (NNS passengers)) (PP (IN of) (NP (NNP Flights) (CD 93)))) (PP (IN over) (NP (DT the) (NN intercom)))) (. .)))