This was the first of several occasions on 9/11 when flight attendants took action outside the scope of their training, which emphasized that in a hijacking, they were to communicate with the cockpit crew.
( This ( ( was ( ( ( the first ) ( of ( ( several occasions ) ( on 9/11 ) ) ) ) ( when ( ( flight attendants ) ( ( took action ) ( outside ( ( the scope ) ( of ( ( ( their training ) , ) ( which ( emphasized ( that ( ( in ( a hijacking ) ) ( , ( they ( were ( to ( communicate ( with ( the ( cockpit crew ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBD was) (NP (NP (DT the) (JJ first)) (PP (IN of) (NP (NP (JJ several) (NNS occasions)) (PP (IN on) (NP (CD 9/11))))) (SBAR (WHADVP (WRB when)) (S (NP (NN flight) (NNS attendants)) (VP (VBD took) (NP (NN action)) (PP (IN outside) (NP (NP (DT the) (NN scope)) (PP (IN of) (NP (NP (PRP$ their) (NN training)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD emphasized) (SBAR (IN that) (S (PP (IN in) (NP (DT a) (NN hijacking))) (, ,) (NP (PRP they)) (VP (VBD were) (S (VP (TO to) (VP (VB communicate) (PP (IN with) (NP (DT the) (NN cockpit) (NN crew))))))))))))))))))))) (. .)))
The flight attendants had no training for the situation and therefore did not take action.
( ( The ( flight attendants ) ) ( ( ( ( ( had ( ( no training ) ( for ( the situation ) ) ) ) and ) therefore ) ( ( did not ) ( take action ) ) ) . ) )
(ROOT (S (NP (DT The) (NN flight) (NNS attendants)) (VP (VP (VBD had) (NP (NP (DT no) (NN training)) (PP (IN for) (NP (DT the) (NN situation))))) (CC and) (ADVP (RB therefore)) (VP (VBD did) (RB not) (VP (VB take) (NP (NN action))))) (. .)))