"I was scared to death": Jill Biden recalls Sept. 11, 2001

When Jill Biden realized that terrorists had attacked America on Sept. 11, 2001, her husband, Joe, wasn't the only loved one whose safety she worried about.

Biden recalled being "scared to death" that her sister Bonny Jacobs, a United Airlines flight attendant, was on one of the four hijacked airplanes that were flown into New York's World Trade Center, the Pentagon and a Pennsylvania field, killing nearly 3,000 people.

After learning that her sister was safe at her Pennsylvania home, "I went straight to Bonny's house," Biden told The Associated Press in an interview Saturday as she and her sister remembered that day.