More than 850 flights were canceled only in Chicago. Some of Southwest’s Midway-bound planes returned to their point of origin while others diverted to Indianapolis, Cleveland, Columbus, Louisville, and Pittsburgh. The impact was national and major. Even his strange action, the contractor who produced this unprecedented situation is not considered a terrorist. The Federal Aviation Administration declared he was authorized to be at the site where the fire occurred. The employee, a 50-year –old man, suffered self-inflicted wounds in possible suicide temptative and was treated at the hospital. O’Hare international airport had this week the title of the “world’s busiest airport.” Crews of the Aurora Fire Department , the FBI and the DuPage County Arson Task Force were on the scene. The building was evacuated of all other employees and airspace management was transferred to adjacent air traffic facilities. Thousands of passengers were left stranded.No one could be sure when full service would resume.