The automatic landing system on military aircraft penigabz talked about also exists in airliners. It involves flying a "coupled approach" where the plane's automatic pilot is coupled to ground-based signals on the final approach to the runway. Using those signals, the airplane follows a "radio beam" until it reaches the runway. If properly certified, the plane can actually land itself without human intervention save for the act of moving the throttles to idle thrust. Even braking and steering on the runway can be done automatically. Most large jetliners nowadays can do automatic landings (yes, even the ones flown by PAL and Cebu Pacific). In fact, in really poor visiblity that is the only way to get the aircraft on the ground.
Don't worry, there is no way terrorists can control a plane remotely even if they wanted to. They can't hack into the autopilot system and fly the plane from the ground because the system's architecture won't allow it.
Bad weather, an instrument approach, an airline being monitored for safety issues by EU aviation authorities. Without pre-empting the results of the investigation and any conclusions on the exact cause, I think it would be safe to say the accident had more mundane causes other than terrorists taking over remotely.
Ambut lang kaha sa Decepticons.
Re the child survivor. It will probably be found that the plane impacted the water at a shallow rate of descent and at a speed close to landing speed. If it had gone into the water in an uncontrolled dive, we wouldn't be talking about how lucky anyone could have been to survive the crash.