Maybe not....if during the 3-9 day period, let's say they don't present symptoms until day 7. Day one they are infected, and maybe on day 4 they take a flight from point A to point B....actually too chilling to think about.
A few years ago I read the Ebola book "The Hot Zone", this book gave both documented cases on the spread of the disease and a hypothetical spread via air travel. Short synopsis...one infected individual spreads the disease to a percentage on a flight. When those travellers reach their varied destinations; they spread the disease to those people they come in contact with and it spreads expotentially from there. By the time they are infected and presenting symptoms it is too late.
Your posts show that you have been very busy...
I have just finished a design project, and I am much too tired to read more than the first few sentences of your new posts.....the big picture, especially when tired, is almost overwhelmingly frightening.