A year after two airliners were deliberately flown into New
York's World Trade Center in a devastating act of terrorism, reporter Gavin Hewitt presents a minute-by-minute account of how US air defence systems responded to the events of 11 September. Interviewees include key decision-makers and personnel, among them pilots who were scrambled to defend possible targets, the transportation secretary who grounded all commercial planes in US airspace, and those entrusted with defending President Bush on Air Force One. Producer Peter Molloy ; Executive producer Fiona Murch