I see AA 1 flight from JFK to LAX / and other flights, and they are not mine

Flight AA 1 is a sample flight that you can add when you start using the app.

If there are other flights on the map that are not yours, check the "My" folder on the Trips screen. The flight may have been imported from a connected inbox account.

You can easily delete any flight. Read more about how to delete a flight in this article.