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There is no specific cruising altitude for a Boeing 747. Cruising altitude is the height at which the maximum fuel efficiency can be achieved and that depends on wind speed, temperature, cargo load and other factors. For a Boeing 747 the best fuel economy can usually be achieved between 35,000 and 43,000 feet.Source:
by Tveg on December 2nd, 2009
It varies with the weight the 747 is at. When very heavy, an initial cruising altitude will often be 28,000 - 29,000 feet. As fuel is burned off enroute, altitude increases as the optimum altitude increases when the aircraft becomes lighter. In general in the 28,000 - 41,000 foot range.
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