In my opinion, based on early reports of the terrible accident, and photographs of the scene; this was NOT a terrorist attack.
There are a number of key things which indicate this information. Nobody reported an explosion on the plane, or fireballs falling. The Crash site was at 6,800 feet, explosions don't have a crash site. The wreckage was left in a trail close to the scene of the accident, all the pieces were tiny; if there had been a mid-air explosion, the wreckage would have spread over a far wider area, and been in larger chunks. Reports say the plane fell for eight minutes before the crash; planes which explode don't do that.
I am no expert, nor am I at the scene; during my Royal Air Force days, I did attend two crash sites, and neither resembled the scene in the Alps.
Nobody was to blame.
The first thing to find is the cause of the accident. No finger of guilt should be pointed. In my opinion metallurgy is the most probable cause. Metallurgy is one of the most recent sciences to be examined, as recently as 1912 people had no idea of the effect of cold on metal. Unlike many sciences, metallurgy is not an exact science, we can only make assumptions based on stress factors. At any time, anywhere, metal can break.
Operation Red Flag
I witnessed the results of the aftereffects of metallurgy during my tour of Germany. We were on a big NATO exercise, involving exercises in America. One of the Buccaneer aircraft of XV Squadron was flying in Arizona, when for no reason, the wing folded. Buccaneers are naval aircraft, with a split wing designed for aircraft carriers. It was found the pin holding the wing had sheared. The pilot ejected to safety,and the exercise was cancelled when all the Buccaneers were grounded.
In my view, the most likely scenario is one of the hydraulic pipes had a split. The hot fluid on the inside, combining with the freezing temperature in the hold caused an explosive reaction, which decompressed the plane.
This would have been noted by the crew in the cockpit, at that height, and temperature the passengers would have died quickly. The next priority for the pilot was to bring the plane down, and minimize the death toll. The crew knew they needed to crash into the mountains, which is why the plane went into such a steep descent. Once over the mountains, they would cross over cities, and the death toll would be horrific.
There was no SOS call for a number of reasons in my opinion. Firstly, I agree with the official reaction, the pilots were dealing with something catastrophic, and had no time. Also, SOS is a call for help; they realised that at that altitude, if they survived the crash, the rescue services had as little as 20 mins to get to them before rescue became recovery.
While I agree his decision to announce this wasn't an act of terrorism was quick. I understand his reaction. With the memory of the Paris massacres, and Je Suis Charlie, followed by the destruction of the cultures of the Middle East; the last thing we needed is more Anti-Islamic violence.
As a final note, if this was an attack, as yourselves, why this plane, on this route, at this spot?
If you're making a killing for your God. This is hardly Paris, 9/11, or the destruction of a civilised world. True, Lufthansa own GermanWings, but this was an internal flight carrying people from Barcelona to Dusseldorf, not a major flight. The flight was mainly Germans, and unlike the rest of Europe, the Germans won't sit back, and let you get away with killing their citizens. I spent two and a half years in Germany, and know they would mobilise troops, and hunt the perps down, with little regard for what Europe thinks.