The Answer:

On Nov. 22, 1963, after President Kennedy was shot in Dallas, Vice President Johnson and Jackie Kennedy returned to Air Force One, where Judge Sarah T. Hughes gave the presidential oath of office to Johnson.

President Kennedy had appointed Sarah Hughes to serve as a federal district judge in 1961. She was the first woman to hold such a post in Texas. To read more about Sarah T. Hughes, visit this informative site.

—The Fact Monster