(S (S (BASENP (DT The) (NN ban)) (VP (VBD was) (VP (VBN imposed) (PP (IN after) (NP (NP (BASENP (DT a) (NN string)) (PP (IN of) (BASENP (NNS accidents)))) (COMMA ,) (SBAR (WHPP (IN of) (WHNP (WDT which))) (S (BASENP (DT the) (NN three) (RBS most) (JJ important)) (VP (VBD were) (NP (NP (NP (BASENP (NNP Adam) (NNP Air) (NNP Flight) (NNP 574)) (COMMA ,) (NP (BASENP (DT a) (JJ 102-fatality) (NN accident)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (S (BASENP (DT a) (NNP Boeing) (NNP 737-43Q)) (VP (VBD plunged) (PP (IN into) (BASENP (DT the) (NN ocean))))) (SBAR (IN after) (S (NP (BASENP (NNS pilots)) (VP (VBN distracted) (PP (IN by) (BASENP (NN instrument) (NN failure))))) (VP (VBD failed) (S (VP (TO to) (VP (VB maintain) (BASENP (NN control)))))))))))) (COMMA ,) (NP (BASENP (NNP Adam) (NNP Air) (NNP Flight) (NNP 172)) (COMMA ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (BASENP (DT another) (NNP B737)) (VP (VP (VBD snapped) (PP (IN in) (BASENP (NN half)))) (PP (IN after) (BASENP (DT a) (JJ hard) (NN landing)))))))) (CC and) (NP (BASENP (NNP Garuda) (NNP Indonesia) (NNP Flight) (NNP 200)) (COMMA ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (BASENP (DT a) (JJ third) (NNP B737)) (VP (VP (VBD attempted) (S (VP (VBG landing) (PP (IN at) (BASENP (JJ extreme) (NN speed)))))) (CC and) (VP (VP (VBD overshot) (BASENP (DT the) (NN runway))) (COMMA ,) (S (VP (VBG killing) (BASENP (NN 21)))))))))))))))))) (PERIOD .))