3 ms·Not when it is mandatory for small and slow planes where the system cost is a big problem.by AdrianB1 4y agoNot when it is mandatory for small and slow planes where the system cost is a big problem.pc86 4y agoSmall and slow airplanes can still hit things and kill people.loeg 4y agoBoats also hit things and kill people.AdrianB1 4y agoCars kill way more people than small planes.