MH370 was a multi-national class-action lawsuit filed in SC that was only dismissed because the circumstances of the disappearance were not clear and nothing to do with it being multi-national
https://www.documentcloud.org/documents/3512628-16319045179....
With the Lion Air crash the settlements the Indonesian government had passengers sign included waiving any right to sue Boeing in the USA
https://www.nytimes.com/2019/03/21/world/asia/lion-air-crash...
The fault being with Boeing in this case seems a lot more clear-cut