Starting shivah when the funeral is on another continent

Hello,

Where a relative passes away on another continent, and some of the family travels to the funeral while the rest remains at home, those who remain home begin their mourning immediately. This is because there is no way that they will be at the funeral.

(Rav Moshe Feinstein, Igrot Moshe Yoreh Deah 1:253)

[Note: Rav Moshe's case is of family members in the USA and a funeral in Belgium. I do not know how Rav Moshe would define the limits of this application - for example, a case of a death in Mexico and family members in New York.]

Have a good day,
Mordechai