Case Air Flown
why don't planes fly at lower altitudes which has breathable air outside in case of any emergency?

If you are flying at lower altitudes which has air outside which humans can breath why dont planes fly at that altitude in case of any ermergency eg. a broken window or something.

The above answers about the fuel consumption are correct.
However the main reason aircraft started flying high was so they could be above the weather.
Most of the atmosphere's weather is 18,000 ft and below.
Flying above it increased passenger comfort enormously.
I believe the first person to actually have the idea was Howard Hughes.
Once they were able to get airliners that high the fuel savings and extra speed kind of fell in line.
So yes it does save fuel but the original idea was passenger comfort.
By the way an airliner has to be able to get down from altitude within a specific period of time if there was a cabin decompression. The new airliners that are flying up to 50,000 ft are in a whole new category. I am not positive, someone may correct me, but I think the standard is 10 minutes to get to 12,000 ft asl from cruising altitude.

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