The black box of the plane is indestructible, why do they not make the plane of the same material ?

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<br /><br /> <div style="background:#d4f0fc;border:6px solid #c4e6f5;width:300px;text-align:center;"> <div style="border:6px solid #cdeaf7;padding:15px;color:#000000;"> <b>The black box of the plane is indestructible</b><br /><br /> The black box of the plane is indestructible, why do they not make the plane of the same material ? </div> </div> <b><br /><br /> <a href="http://www.orkut.co.in/Main#CommunityJoin.aspx?cmm=51112316"><<< Send SMS, Jokes, Shayaris to your friends - www.majaak.com >>></a> <br /><br /></b>

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