(S (S (S (BASENP (PRP It)) (VP (VBZ is) (NP (NP (BASENP (DT the) (JJS largest) (JJ commercial) (NN passenger) (NN airliner)) (PP (IN in) (BASENP (DT the) (NN world)))) (COMMA ,) (PP (IN with) (BASENP (DT an) (JJ 840-passenger) (JJ maximum) (NN capacity)))))) (COMMA ,) (SBAR (IN though) (S (BASENP (NNP Qantas) (POS 's)) (VP (MD can) (VP (VB carry) (BASENP (NN 450))))))) (PERIOD .))