Hi,
Welcome to our forum and thanks for contacting us.
As you can see in the example above, flight routes are lines with a path connecting two map points coordinates. You get their coordinates using
chart.get('mappointID') method. You cannot connect 2 countries.
You can add fake map points on country coordinates, disable mouse tracking on them and then connect point on Canada with a point on France.
jsFiddle:
https://jsfiddle.net/BlackLabel/f9pzn3d4
Let me know if you have any further questions.
Best regards!