The big day finally arrives for everyone at Heathrow Airport. The Day leaders from all over the world land in heathrow airport. Already the busiest airport in Europe, with 1 plane arriving and departing every 45 seconds, it is going to be a tough and long day. Everyone already knows this however the don't know quite how difficult it will be. Of course, with so many world leaders arriving, security is raised and every possibility thought of. But what happens when terrorists find a way around all security? It is up to police, military and a small group of civilians to save hundreds of people, including world leaders