I agree with L-188; don't tell a petroleum engineer at ExxonMobile that JETA is JEt A...
Fuels are "cracked" based upon a set of specifications. Crude oil, like any other natural product, can vary significantly based upon the different feedstocks that were used to make a certain blend. Refineries are batch process that are constantly tweaked to produce fuels (JET A for ex) that conform to a range of specs in terms of flash point, specific gravity, freezing point, cetane rating (not octane). Needless to say, it varies from refinery to refinery, and certainly from batch to batch. The amount of water and unwanted microbes/organisms is another variation in overall fuel quality, and certainly diverges from "SAT" the longer fuel is stored.
Gas turbines will certainly burn, or can be modified to burn, just about any hydrocarbon. The TPE331 can burn avgas for a period as long as oil is added to the fuel, as jet fuel has lubricant properties that avgas does not contain.
One of the problems in investigating TWA 800 was trying to recreate the flashpoint of that batch of (ullage) Jet A. If the flashpoint of that fuel was a specific, known, and repeatable quantity, then several variables would have been eliminated in resolving that accident.