I accept the ingenuity of people. Though, if 1% of your planes have issue that causes them to stop working midflight after 1 year, at worst you'll lose a few p

I accept the ingenuity of people. Though, if 1% of your planes have issue that causes them to stop working midflight after 1 year, at worst you'll lose a few pilots and fix the issue by inspecting rest of the planes. Backtracking and fixing issues after giving a vaccine to millions of people is a bit more problematic. Not just technically, but also in gaining the trust back, etc.