As previously mentioned, O'Hare has been processing record numbers of flights and passengers in recent years. Unfortunately, they've also been having record numbers of delayed flights (14,500 delayed flights in the month of May alone!), and obviously those delayed flights can cause further delays in other airports. So the FAA wants O'Hare to reduce its number of flights, and will come up with some flight reduction numbers by Monday. Does this mean that O'Hare will lose the World's Busiest Airport title to Atlanta's Hartsfield-Jackson International? We shall see.