Bottom line, he thinks the cover-up would be either of a terrorist attack, as happened to a plane on the runway in Thailand not long after TWA 800 and was officially ascribed to a hot runway and fumes, but which actually had targeted the then-Thai leader and missed, or a cover-up of an accidental gov't shoot-down as in TWA 800.
He's seen gov't investigations turned into cover-ups, with TWA 800 and the Thai case.
Thank you