1) would you be able to internationally travel by:
travelling to the year 2001, fly a plane to the desired destination, and then go to the future from there?

2)If each world line is seperate from the others, then wouldn’t the consequences of your actions now have no effect on your original worldline? If this is the case, why won’t you tell us things that will give us knowledge or let us avoid death? My only geuss is that you are not a time traveller, and don’t want to say anything that could make a gullable person do something stupid.

3) how can I leave a message for myself in the future if the things i do in this worldline do not effect the others?