So my question to the many Pro,s on this forum is if fuel tank design have been much improved from the 60,s and 70,s?
The answer would have little bearing on this accident unless the specifics are known.
Fire is predicated on aircraft breakup (how the g-loads were distributed) as well as sources of ignition coupled with misting effects of any leaking fuel.
Rain and snow on the ground are your friend.
Eventually we'll get a report on the amount of fuel laying on the ground that the rescuers and passengers walked through.