This would make one heck of a suicide bomb.
There are nukes and dirty nukes out there. What they lack is a dependable delivery system. I hope safeguards are in place that would prevent this plane from “pretending” to be some other flight. I don't know.
I do get the distinct impression that we being “fed” information: they are telling us things now that they knew in the first 24 hours. That suggests this is quite bad and they don't want us to know how bad it is while they try to nullify the threat.
I'm sincerely hoping this ends up being a tinfoil hat post.