"[federal prosecutors] explained that they were unable to put Mr. Aleynikov on the “no-fly” list..." I wonder why...? Seems like many manage to get on the NFL

"[federal prosecutors] explained that they were unable to put Mr. Aleynikov on the “no-fly” list..." I wonder why...? Seems like many manage to get on the NFL by accident, and the feds can't manage put a "flight risk" on it? Who can they put on it?