Thickness of Runways?

From:         papadopo@cs.utk.edu (Philip Papadopoulos)
Date:         22 Nov 93 15:41:06 PST
Organization: CS Department, University of Tennessee, Knoxville
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How thick is the average concrete runway that is capable of handling
"heavies" (e.g. 747,767, MD-11, L1011, AB300, etc.)?   

Thanks,
Phil