With the premise 'The threat of terrorists hijacking commercial airliners within the United States-and using them as guided missiles-was not recognized by NORAD before 9/11.', is 'NORAD didn't recognize that airplanes could pose a serious threat,' simply an unrelated statement?
The threat of terrorists hijacking commercial airliners within the United States-and using them as guided missiles-was not recognized by NORAD before 9/11.###NORAD didn't recognize that airplanes could pose a serious threat,