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Jet airplanes fly at high altitudes because it is more fuel efficient. Flying at higher altitudes uses less fuel than flying at lower altitudes.
Because the air is thinner there
One advantage is that there is usually less turbulence at higher altitudes. I think because you are flying higher than those "pockets" of turbulence that you experience at lower altitudes.
Should you be flying does barometric pressure go up or down
as their is high pressure inside and low pressure outside and air moves
Ducks normally fly from 200 to 4,000 feet when migrating, but are capable of flying much higher.
Germany's A4/V2 rocket reached altitudes of between 52 and 60 miles.
fly at odd thousands plus 500 ft (3,500;5,500 ect)
fly at even thousands plus 500 ft (4,500;6,500 ect)
When flying at hight altitudes (+12,000FT) planes pressurize the cabin so passengers can stay conscious without wearing oxygen masks.
At high altitudes the atmosphere is less dense that at lower altitudes. This means that planes flying higher experience less drag (friction) than those lower down, so that means they can go faster.
At high altitudes the atmosphere is less dense that at lower altitudes. This means that planes flying higher experience less drag (friction) than those lower down, so that means they can go faster.