Never suspected that terrorists would fly planes into buildings?
US leaders repeatedly claimed that they never suspected that terrorists might fly planes into buildings. And so no one at the FBI, CIA and the military apparently took such a scenario into account. In 1999, USA Today published a story in which such potentiality was actually mentioned.
According to USA Today of April 26, 1999, two students who carried out the attack at Columbine High “dreamed of an even bigger bloodbath, plotting to kill hundreds of neighbors, then hijack a plane and crash it into New York City, investigators said Monday.”
The article is attached here.