The most obvious reason why a pilot would turn off the transponder is to make their plane invisible to commercial radar or other nearby planes. The Montreal Convention governs the amount of compensation airlines must pay when a passenger is injured or dies aboard an international flight. Relatives will also be able to file suit in their home countries against Malaysia Airlines. The Montreal Convention stipulates plaintiffs can file suit in five locations: the domicile and principal place of business of the airline, in this case Malaysia; the end destination; the country where the ticket was purchased, and the place where the passenger lived. The Montreal Convention's rules about where suits can be filed apply only to airlines, so relatives could also try to sue the American aircraft manufacturer Boeing in a U.S.