<page_title> History of United Airlines </page_title> <section_title> Historical fleet </section_title> <table> <cell> United's original 737-500 fleet had been retired by 2009. More 737-500s were inherited from the merger with Continental Airlines and these were retired by May 2013. <col_header> Notes </col_header> </cell> </table>
While United`s 737 fleet retired in 2009, United Airlines ended up merging 737s with Continental.