The real problems are finding out which systems will be more trouble than they are worth… remember that if safety was really the only concern every passenger would have an ejection seat and rubber boat… of course the direct cost and hidden cost of extra weight and maintainence just means it isn’t going to happen.

Equally, how many fires started by flares, or blinded aircraft enthusiasts will it take before insurance companies star raking in serious money for every anti MANPADS system used.

None of the CMs mentioned would stop a laser beam riding missile, or wire guided anti tank missile.