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Originally Posted by Ramrod
You forgot that the plane is pressurised  I can see Shooters Hill from here but I ain't runnin up it 
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No I didn't the plane is pressurised to 7000ft, cruising altitude is anything from 20 - 40k ft. So once at pressure you can safely set your watch to 7000 ft as that is where the cabin is pressurised to.
Neat link
http://perso.wanadoo.fr/mirabilevisu/cpcs.htm
>>> Which is why you can never get a good cup of tea on a plane as the water boils at below 100 deg C, and why you get drunk quicker.