Does 'At 9:39, the FAA's Cleveland Air Route Traffic Control Center overheard a second announcement indicating that there was a bomb on board, that the plane was returning to the airport, and that they should remain seated.' stand in direct opposition to the premise 'The FAA's Cleveland Air Route Traffic Control Center heard an announcement about a bomb being on the plane.'
At 9:39, the FAA's Cleveland Air Route Traffic Control Center overheard a second announcement indicating that there was a bomb on board, that the plane was returning to the airport, and that they should remain seated.###The FAA's Cleveland Air Route Traffic Control Center heard an announcement about a bomb being on the plane.