Here’s another one linked to biological terrorism and it would also prevent the spread of the flu and the cold.
Install hepa filters in the recycled air in planes. This would cost next to nothing. Right now if a person travels they are guaranteed to catch any disease that someone else has on a plane.
It’s funny how the US government can spend billions on terrorism but cant introduce this simple measure. Then again this isn’t related to improving the profit margins of certain corporations so it’s kind of obvious why this measure has not been introduced.