Flying High ?

Date:         11 Feb 98 04:23:53 
From:         Nathan Pusey <nat@cairns.net.au>
Organization: Cairns Network Services
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Hello,
        Can somebody please explain to me why planes (jet aircraft) fly
at very high altitudes on long range flights, and how does this conserve
fuel and get maximum distance ? How does this conserve fuel and save
time if you can only go half the speed you normally can go at low
altitude and you have to use twice the amount of power to get too half
the power you get at lower altitudes ?

                                        Thanks in advance.