(S (S (S (NP (BASENP (DT A) (NNP Cathay) (NNP Pacific) (NN passenger) (NN aircraft)) (PP (IN from) (BASENP (NNP Hong) (NNP Kong)))) (VP (VBD was) (VP (VBN escorted) (PP (IN by) (BASENP (NN two) (JJ Canadian) (NN military) (NN aircraft)))))) (SBAR (IN after) (S (BASENP (DT the) (NN pilot)) (VP (VP (VBD issued) (NP (BASENP (DT an) (NN alert)) (PP (IN of) (BASENP (DT a) (NN bomb) (NN threat))))) (PP (TO to) (BASENP (DT the) (NN aircraft))))))) (PERIOD .))