If someone is planning on triggering a bomb on a plane, and they haven't done so, you can assume they have a target you haven't reached yet. So going back is not only the safe option, but also the location the people & plane came from.
The only thing it protects is the target. If there is a terrorist on board and they expose the fact they are aware of the bomb, or the bomb is minimally capable, the plane is doomed whatever they do.
The only thing it protects is the target. If there is a terrorist on board and they expose the fact they are aware of the bomb, or the bomb is minimally capable, the plane is doomed whatever they do.