When it comes to the original crop of the Airbus A320 family, these twinjets have a service ceiling of between 39,100 ft and 41,000 ft. This is between 11,917 m and 12,497 m.
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To maintain their operational ceiling of 70,000 feet (21,000 m), the early U-2A and U-2C models had to fly very near their never-exceed speed (VNE). The margin between that maximum speed and the stall speed at that altitude was only 10 knots (12 mph; 19 km/h).
A higher elevation will require a longer climb, meaning the aircraft will burn more fuel in order to reach its cruising altitude. Additionally, 35,000 feet gives more time for airline crew to address any unexpected mid-flight incidents.
Airbus estimates that their A320 series aircraft have a lifespan of around 60,000 flight hours or 24,000 flight cycles. The A380 series aircraft have a lifespan of around 25 years or 60,000 flight hours.
In the case of flight 1549, the pilots of the Airbus A320 made a decision to land in the Hudson River after apparently losing power in both engines. In aviation terminology, that type of landing is referred to as ditching, and as far as jetliners go it remains a fairly rare event.
Commercial jets, however, have more sensors and control measures to prevent midair collisions, meaning they generally aren't affected by traffic. Private jets lack the high-tech sensors and controls of commercial jets, so pilots operating them typically fly at a higher altitude where there's less traffic.
Aerodynamic altitude: If a commercial airliner flies too high, it will encounter less dense air passing over the wings to create lift. This can cause the plane to stall and fall out of control. Depending on the weather conditions and aircraft weight, this can occur anywhere between 40,000 and 45,000 feet.