The development in aircraft speed and comfort, that mainly came down to the role the aircraft was designed and built for.

People thought you would die over 20mph in the early trains an the 1800s. Then the speeds increased and no one died from Speed in a train. 

The first aircraft were open cockpit but speed increased, from the Wright Brothers to Louis Bleriot and onwards to the aircraft of the First World War. Converted military aircraft became eh model for passenger aircraft and the passenger and pilot accommodation improved with enclosed cockpist and cabins depending on the aircraft role. 

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