hot-air balloon
Aircraft travel in the troposphere. This extends from ground up to about 50,000 feet.
The troposphere is the layer of Earth's atmosphere where the Concorde could travel because it is the lowest layer where most weather occurs, offering a relatively stable environment for flight. Additionally, the troposphere is dense enough to provide lift for the aircraft and contains most of the atmosphere's oxygen for combustion during flight.
No, jets are not in the stratosphere; they typically operate in the troposphere, which is the lowest layer of Earth's atmosphere. Commercial jet aircraft usually fly at altitudes between 30,000 and 40,000 feet, which is still within the troposphere. However, the stratosphere, located above the troposphere, starts around 33,000 feet and extends to about 164,000 feet, where weather patterns are less turbulent. Some high-altitude research aircraft may reach into the lower stratosphere, but conventional jets primarily operate in the tropospheric layer.
The Concorde aircraft cruised at Mach 2 at about 19,000 m (62,000 ft), and the SR-71 cruised at Mach 3 at 26,000 m (85,000 ft), all within the stratosphere.
The stratospheric region of earth contains a layer of ozone called as the ozone layer. This layer of ozone protects us from the harmful ultraviolet radiations of the sun thus acting as a blanket. ozone however is also found in small concentrations in the tropospheric region. But because of the small concentrations it is considered to be negligible as compared to stratospheric ozone.
Stratosphere
the palisade layer, spongy layer
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Yes they damage, But commercial aircraft do not do that much damage.