What sort of terror group would pull this off and then not claim responsibility for it? As far as I’ve seen, there haven’t been any claims of responsibility at all, much less credible ones. And the mix of passenger nationalities and the Air France banner don’t appear to make this flight a likely terror target.
I would just note that it’s possible that some terrorist group has in fact claimed credit - to sources that are being kept quite ...
My only thought that might make sense regarding terrorism is a lone terrorist like the pilot of that plane that went down several years ago, with the co-pilot praising Allah and taking it straight down.
I also considered carbon monoxide posioning which could have killed everyone, like the plane of the golfer a while back, and if the plane was struck by lightning it could disengage the electrical system, and it went straight down.
After 9/11, Al Quaeda didn’t claim credit for dozens of months. Bin Laden finally admitted, on video, that the attacks went better than they could have possibly imagined or planned.