A little off topic perhaps since most of you are disqussing the cause,but one thing strikes me.This seems to be another crash of a more modern 737 where the aircraft is not catching fire .Neither did the thurkish one in Amsterdam or the BM in Kegworth.There is also several other NG and Classic crashes where you don,t have a post crash fire.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?