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.
