You, and others, keep saying this. I guess you missed the list of unclaimed airplane bombings that have been posted on several threads, including this one, since this has happened.
The object of bombing a plane is to kill people, so I would say that IF terrorists brought down this plane they did indeed obtain their objectives.
Not all terrorists claim credit for terrorists acts, and there are several valid reasons why this is so. One of the most important is the fact they may be planning other strikes on more aircraft and don't want to claim credit at this time, another reason is: Why claim credit when fear can be imposed by simply bringing down as many planes as possible. It would soon be evident to even the most dense person that it was terrorism working.
I am not saying this crash was the result of terrorism, I am saying that simply because no one claimed credit doesn't mean it WASN'T terrorism, quite the contrary.
Is there a link to the passenger list of the Brazilian plane?
I am wondering if there were any prominent people on board...politicians, bankers, etc. or anyone else who would draw a “hit”, like international gangsters.