In United 93, Greengrass creates a gripping, provocative drama that tells the story of the passengers, crew and the flight controllers who watched in dawning horror as United Airlines Flight 93 became the fourth hijacked plane on the day of the worst terrorist attacks on American soil: September 11, 2001. The filmmaker explores the events of this day by telling the story of a single flight and the ordinary, random sampling of flight crew, businessmen, wives, grandparents, students and others bound for San Francisco aboard a Boeing 757. In the course of the just over 90 minutes that the plane was aloft, the world below entered a new and violent age - viewed through a fog that slowly dissipated to reveal that America herself was under attack.