When my husband and I first heard about this crash, I think the first thing that came into our minds was pilot error. We have had quite a discussion over the past couple of days about the crash. Please note here that my husband is a qualified aeronautical engineer and former aeronautical engineer officer in the RAAF.
Over the past few years I have been in the habit of watching the series on aircrash investigations and I have learned a lot from those documentaries. In this way I have some understanding about how some crashes might happen.
To allay fears of conspiracy cover-up, this crash was not due to a bomb going off. The best that we can guess at the moment is that the pilot was coming in too low for the landing in San Francisco. As a result the wheels of the aircraft tipped the sea wall, this led to the tailplane coming off, and it immediately led to the deaths of the two 16 year old Chinese students. After the tailplane sheared off, the plane then flipped a few times. This accounts for the high level of injuries inside the plane. The fire was due to damage to the fuel tanks.
There will be a detailed investigation. The investigators will check the flight path records from the POV of Air Traffic Control. If there was any chance that another flight landed immediately prior to this flight and caused any form of turbulence this will be noted. If not, then it was clearly pilot error. What needs to be discovered is why the pilot made such an error on this particular occasion.