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The service ceiling of the Boeing 777 is 43,100 feet. That's as high as it is certified to go. The normal cruising altitude, however, is usually around 35,000-39,000 feet. Most commercial airliners can fly at much higher altitudes than they normally cruise at, but are limited by both the ability to pressurize the cabin and the ability to descend quickly enough during an emergency decompression. The benefits of flying at higher altitudes do not offset the cost of constructing and equipping the aircraft for certification to fly at those altitudes.

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17y ago

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