Commercial passenger plane speeds are not dictated by regulations. They fly in the most economical way for the company. Private planes fly as fast as they need

Commercial passenger plane speeds are not dictated by regulations. They fly in the most economical way for the company. Private planes fly as fast as they need to. Airplane speeds are only dictated by ATC when you're on approach or departure to maintain separation in a busy area or for noise abatement regulations. Buses will not do 200kmh not because nobody can build a really fast bus, but because it will not be great for passengers to go from 200 to 50 really fast :) Basically same as with planes, passenger confort is the priority. Anyway, if you would read up on Autobahn death statistics, very few deaths are related to over speeding.