(S (S (S (BASENP (NNP Calderon)) (VP (VP (VBD was) (PP (IN inside) (NP (BASENP (DT the) (NN airport) (POS 's)) (BASENP (JJ presidential) (NN hangar))))) (S (VP (VBG waiting) (S (VP (TO to) (VP (VB depart)))))))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NN plane)) (VP (VBD landed))))) (PERIOD .))