Thank you.
There is no perfection in anything, and certainly in security nothing solves everything. If only that weren't true.
If there were a flight from Toronto to Atlanta, then they are flying to the U.S., and that flight would be subject to U.S. requirements. That's how aviation works. If there were a flight from Paris to Toronto, that flight would be subject to French requirements and Canadian requirements. How it works in aviation is that we are able to put requirements on flights coming to us and leaving us. It is the same with the U.S. and with every other country.