What is the service ceiling of different aircraft?
Most commercial jetliners have a service (or certificated) ceiling of about 42,000 ft (12.8 km; 8.0 mi) and some business jets about 51,000 ft (15.5 km; 9.7 mi).
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The static ceiling is simply the point above which the aircraft won't be able to produce enough thrust and lift to sustain that altitude. You'll start losing velocity, and as you do so, also start losing altitude. Nothing fails outright. You just don't have enough energy to climb or even stay level.
The Next-Generation 737 airplanes are capable of cruising to a maximum altitude of 41,000 feet, compared to 39,000 feet for the competition. In addition, advanced-technology Blended Winglets are offered as a production option on the 737-800.
With a maximum certificated service ceiling of 30,000 feet, the King Air 350 has the range to carry large loads on short runways. It can maintain an airspeed of 235 knots at 33,000 feet and a cruise speed of 305 knots at 24,000 feet.
All aircraft have a specified 'service ceiling' that defines the maximum height at which it should be operated. For most modern commercial jets today, this is around 41,000 feet.