(S (S (BASENP (PRP It)) (VP (VBZ is) (VP (VBN reported) (SBAR (IN that) (S (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NN airplane)) (VP (VP (VBD took) (PRT (RP off))) (PP (IN from) (BASENP (NNP Seoul)))))) (COMMA ,) (S (BASENP (NN smoke)) (VP (VBD was) (VP (VBG coming) (PP (IN from) (BASENP (DT the) (NN airplane))))))))))) (PERIOD .))