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Well, the airlines probably aren't paying that much because of volume but they stick it to the corporate ops.
I am not aware of anyone who uses 100% glycol for type one...not sure about type 2
I dont know of any US operator that uses 2. I think it may even been banned in the US for environmental and health reasons.
I think, and dont quote me on this, that type 1 is around 8 bucks a gallon and 4 is around $14. The prices, just like gas are going up.