Most US military aircraft can exceed 50,000 feet, if they really really try. Again, the limits are classified. Most commercial jetliners cruise somewhere between 30,000 and 45,000 feet above mean sea level.
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Although private jets tend to cruise at an altitude of 41,000 feet, they have the capability of reaching heights of 45,000 feet. Altitudes higher than this tend to be reserved for military aircraft that comfortably reach an altitude of up to 51,000 feet.
Not only are military jets faster than airliners, but they are also extremely maneuverable and require a great deal of skill and training to fly. Because of their speed and mobility, they are much more difficult to control.
The maximum height that a commercial airplane is allowed to reach when they fly is 42,000 feet, as this is the universally approved maximum altitude. This max altitude for airplanes is known as the “service ceiling.” Most commercial air jets fly at such a high altitude because it is known to optimize efficiency.
Flying at 45,000 feet plus altitude might avoid traffic and weather, but it also comes with its own risks. For example, if the aircraft was to rapidly depressurize and emergency oxygen fail, the time of useful consciousness at 45,000 feet is just nine to 15 seconds.
The highest certified altitude of an airliner was Concorde's 60,000 feet. Today some of the corporate jets can fly at 51,000 feet. Q: What is the highest cruising altitude allowed? A: Most airliners are limited to 45,000 feet or less.
When an aircraft experiences turbulence, the plane can drop or change altitude suddenly. This is why pilots always caution passengers to buckle up and stay seated when they are experiencing flight turbulence. The sudden movements put passengers at risk.
Airplanes are built very sturdily. In fact, there's a lot of countermeasures built into the engineering of an airplane much like a car has different things to make a smooth ride on a bumpy road, airplanes have so many parts to it that's built into the aircraft to be able to deal with and safely handle the turbulence.
The sweet spot for modern airliners is between 35,000 and 42,000 feet, where the plane's engines are most efficient. The way the wings are designed is also unsuitable for thin-air flight as they would not be able to create enough lift. Planes cannot just keep going up and up - at some point, it will stall.
Business jets and military aircraft:Some business jets can soar up to 15,000 meters, while most military aircraft can fly at this altitude or even a little higher.
The higher you fly, the more efficient it isThe reason planes cruise at high altitudes is that they burn less fuel and can fly faster, as the air is less dense. At 30,000 feet and higher, it is also possible for aircraft to avoid weather systems, making it more comfortable onboard.