<page_title> List of missing aircraft </page_title> <section_title> 1940–1959 </section_title> <table> <cell> June 23, 1950 <col_header> Date </col_header> </cell> <cell> Douglas DC-4 (Northwest Orient Airlines Flight 2501) <col_header> Aircraft </col_header> </cell> </table>
Northwest Orient Airlines Flight 2501 was listed missing as a DC-4 disappeared on June 23, 1950.