The President and the Vice President The President was seated in a classroom when, at 9:05, Andrew Card whispered to  A second plane hit the second tower.
( ( ( ( The President ) and ) ( the ( Vice ( President ( The President ) ) ) ) ) ( ( was ( seated ( in ( ( a classroom ) ( when ( , ( ( at 9:05 ) ( , ( ( ( Andrew Card ) ( whispered ( to ( A ( second plane ) ) ) ) ) ( hit ( the ( second tower ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNP President)) (CC and) (NP (DT the) (NNP Vice) (NNP President) (NNP The) (NNP President))) (VP (VBD was) (VP (VBN seated) (PP (IN in) (NP (NP (DT a) (NN classroom)) (SBAR (WHADVP (WRB when)) (S (, ,) (PP (IN at) (NP (CD 9:05))) (, ,) (NP (NP (NNP Andrew) (NNP Card)) (VP (VBN whispered) (PP (TO to) (NP (DT A) (JJ second) (NN plane))))) (VP (VBD hit) (NP (DT the) (JJ second) (NN tower))))))))) (. .)))
By the time the third plane hit, the President was on his way to an undisclosed location.
( ( ( By ( the time ) ) ( ( the ( third plane ) ) hit ) ) ( , ( ( the President ) ( ( ( was ( on ( his way ) ) ) ( to ( an ( undisclosed location ) ) ) ) . ) ) ) )
(ROOT (S (S (PP (IN By) (NP (DT the) (NN time))) (NP (DT the) (JJ third) (NN plane)) (VP (VBD hit))) (, ,) (NP (DT the) (NNP President)) (VP (VBD was) (PP (IN on) (NP (PRP$ his) (NN way))) (PP (TO to) (NP (DT an) (JJ undisclosed) (NN location)))) (. .)))