What is the difference between cruise ceiling and service ceiling?

From FAA pilot handbook: The service ceiling is the altitude at which the aircraft is unable to climb at a rate greater than 100 feet per minute (fpm). The cruise ceiling, on the other hand, is the altitude at which the maximum climb rate is 300 fpm, though I've not seen it used much.



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Within the airplane flying handbook, the Federal Aviation Authority, FAA, defines the service ceiling as “the maximum density altitude where the best rate of climb airspeed will produce a climb of 100 feet per minute at maximum weight while in a clean configuration with maximum continuous power.”

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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.

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Boeing widebodies Lufthansa previously bragged that its 747-400 could reach the highest altitude in its fleet, with a maximum service ceiling of 44,947 ft (13,610 m). The German flag carrier also flies the modern 747-8, which has a service ceiling of 43,100 ft (13,137 m).

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CEILING- The heights above the earth's surface of the lowest layer of clouds or obscuring phenomena that is reported as “broken,” “overcast,” or “obscuration,” and not classified as “thin” or “partial.”

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A: The highest commercial airliner ceilings are 45,000 feet. It is not uncommon to fly at the certified ceiling of the airplane.

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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.

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No, commercial planes do not fly over Everest due to the dangerous weather surrounding the mountain. However, airlines such as Yeti Airlines and Buddha Air offer a view of Mount Everest on their flights.

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The biggest reason for flying at higher altitudes lies in fuel efficiency. The thin air creates less drag on the aircraft, which means the plane can use less fuel in order to maintain speed. Less wind resistance, more power, less effort, so to speak.

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