Vice-President Lyndon Baines Johnson taking the oath of office shortly after the assassination of President KennedyThe swearing-in ceremony administered by Judge Sarah Hughes in an Air Force One conference room represented the first time that a woman administered the presidential oath of office as well as the only time it was conducted on an airplane. Instead of the usual Bible, Johnson was sworn in upon a missal found on a side table in President Kennedy’s Air Force One bedroom.After the oath had been taken, Johnson kissed his wife on the forehead, who then took Jackie Kennedy’s hand and told her “The whole nation mourns your husband.”