Thanks for the explanation GK430 but can you answer some more questions? How come the roads around the airports didnt suffer from "glazed ice"? How much does the most expensive fluid cost, more or less than a litre of jet fuel? (not to mention the cost of extra flight time and diversions) How much fluid/grit could be purchased and held in reserve with the money lost from landing fees due to diversions? Why do you call it "DE-ICE fluid" when you use it as anti-ice? Why did one major airport manage to have its runway open but be closed because of slippery taiways?