Hi
OverRun,
I noticed that difference as well before yesterday's post and thought I would return to the two links to see what the differences might be. I have done that and I can't account for the Dayton airport planning recommendation. The two main parallel runways for all purposes are flat, no change in elevation from one end to the other. There are periods during the summer when the ambient temperatures exceed 90℉ (32.2°C), but that shouldn't increase recommended runway length by 3,800 ft. So I am at a loss to explain the difference between the two recommendations.
Turbine D