(S (S (BASENP (DT The) (NN plane)) (VP (VBD was) (VP (VP (VP (VBN detained) (PP (IN in) (BASENP (NNP Halifax)))) (PP (IN on) (BASENP (NNP Friday)))) (PP (IN for) (BASENP (QP (RB approximately) (NN four)) (NNS hours)))))) (PERIOD .))