And that's exactly where the biggest hot spots are located, within around an 80 or so mile radius of DFW airport.

Fun facts about DFW airport: Is its own city complete w/it's own police force and fire fighting facilities; DFW contains literally miles of steel guard rails, lamp posts etc. all made of a special alloy that is engineered to rust over, seal itself and then never deteriorate further.

The alloy was used to save $$ by never needing to be painted. This lasted for many years until some bureaucrat decided they wanted to change the color scheme and paint all these metal surfaces.

So now, like the Golden Gate Bridge and other huge structures like it there's a paint crew required to never stop painting DFW airport at a cost of millions annually