I believe they keep it quite a bit lower than that. 10,000 feet is the threshold for needing supplemental oxygen. The 2 dings you hear shortly after takeoff and during the approach are when the aircraft passes through 10,000 feet altitude. This lets the cabin crew know whether or not oxygen is critical in the event of a loss in cabin pressure.

Some people will begin to experience the effects of hypoxia at altitudes of 10,000 feet. Above 14,500 feet, pretty much everyone needs supplemental oxygen.

-gb-

Hi - you mean don't transport it on plane with material on it?

Although symptoms of Hypoxia can occur at different altitudes for different people, I still stand corrected, regulations state 8,000 feet for cabin pressure. How closely that's adhered to I'd think depends on the structural specs of the particular plane.


"Hi - you mean don't transport it on plane with material on it? "

Can transport but not operate, according to Sony.