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Moreover, the oldest airline is KLM, the Koninklijke
Luchtvaart Maatschappij voor Nederland en Koloniën (Royal
Airline for the Netherlands and Colonies). It began operations
in 1919 and in 1920 operated the first commercial flight from
Amsterdam to London. Back then, the cabins weren't closed, so the planes flew low.
After World War II, cabin pressure systems were developed.
And development has not stopped since then.
Scottish engineer James Watt presented the first steam engine
in 1769. However, the origins of the steam engine go back many
centuries where water vapor could be used to move things was
illustrated by Heron of Alexandria, a 1st-century Greek
inventor, who wrote a treatise describing the machine called an
aeolipile which basically consisted of a sphere into which he
had put water and a pair of injectors located in opposite
directions.
Steam Engine
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