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Hello and good morning. That story is amazingly heartbreaking. It is beyond awful. Air bags are not failsafe. In order for them to operate, the crash sensors need to be struck with a certain amount of force. If those sensors are not touched and the impact happens a few inches away, it is possible for the bag to not be deployed. Since the vehicle was airborne, the side air bags would not inflate until impact was made. Once the vehicle struck the tree, it is possible that the impact zone was not where the sensor was. I search and searched to find you some information that could help or resources to point your investigation. I did find one very helpful informative article that I am going to provide the link for. Without a formal investigation of the vehicle, any speculation is not solid. Only after reviewing the damage on the car could reasons for the failure to deploy become clear. Take a look at this article and see if it satisfies any of the thoughts you may have. Again, I am truly sorry to hear about your loss, words can't describe it. http://ezinearticles.com/?My-Air-Bag-Did-Not-Deploy---What-Went-Wrong?&id=1293769
Your JA Expert,