Take the following as truth: 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.
Then the following statement: "The FAA's Cleveland Air Route Traffic Control Center heard an announcement about a bomb being on the plane, but none was ever discovered." is true, false, or inconclusive?
Answer: Inconclusive