They can still do a trade route if they go Northwest then North above Asia and Europe near the forbidden poles and then travel East and West then South to wherever they want in Europe, Asia or North America
But they do not
Because flat earthers are not allowed to explore the North and South Poles
@shortstories Do not know how muc it will help when they have Strait of Gibraltar or they can use cargo plane to EU or to Israel and use mediterranean sea for ships