I think Jack had mentioned a Cherokee 6 or an Arrow - some six-seater single-engine (probably turbo’d) plane that could reach that 16,000-25,000 altitude. Packed with explosives to T-bone the 747.
My TWA captain friend (now passed) talked to me at length about that, especially the chemical residue on the seats’ fabric. It’s been a long time since I’ve read anything on TW800, so the details are a bit fuzzy.
Not one person mentioned any evidence of a second plane. I saw the radar tapes-—does not appear to be any blip near 800.
Then wreckage of the Cherokee 6 or Arrow would have been found at the crash site. It wasn't.
There was something about how the seats were stored if I remember correctly.