[lemma=fifth] [lemma=largest] [tag=NNP] [□=□]
[lemma=fifth] [lemma=largest] [tag=NNP] [lemma=□]
[lemma=fifth] [lemma=largest] [tag=NNP] [tag=□]
Houston-based Continental Airlines is the fifth largest U.S. domestic airline and the sixth largest airline worldwide , operating a hub-and-spoke system with domestic hubs at Houston , Newark and Cleveland .