[United Air Lines Mainliner, NC-25611], photograph, 195X; (https://texashistory.unt.edu/ark:/67531/metadc2303528/m1/2/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
[United Air Lines Mainliner, NC-25611], photograph, 195X; (https://texashistory.unt.edu/ark:/67531/metadc2303528/m1/2/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .