I know that Jet A-1 is the most widely used fuel in the commercial airline market, but what is its market share in percentage?
Are there any big users of Jet A rather than Jet A-1? And if so, why?
Jet A is used in the United States while most of the rest of the world uses Jet A-1. The important difference between the two fuels is that Jet A-1 has a lower maximum freezing point than Jet A (Jet A: –40°C, Jet A-1: –47°C). The lower freezing point makes Jet A-1 more suitable for long international flights, especially on polar routes during the winter.
However, the lower freezing point comes at a price. Other variables being constant, a refinery can produce a few percent more Jet A than Jet A-1 because the higher freezing point allows the incorporation of more higher boiling components, which in turn, permits the use of a broader distillation cut. The choice of Jet A for use in the United States is driven by concerns about fuel price and availability. Many years of experience have shown that Jet A is suitable for use in the United States.
Notably, the US is also the single largest market for aviation fuel worldwide, so it has the volume to support a separate type. There's consumption numbers in the same document.
The disadvantage with Jet A is with long-haul flights that experience cold air, the 7 degrees can make a difference, forcing the flight to descend to warmer levels to heat the fuel, increasing consumption.
One thing that can be done is a sample of the loaded fuel is taken and the actual freeze point determined, and that number used in flight. Usually for Jet-A this lies somewhere in between the two specs.
I can't speak much for private jets but most airlines including Southwest, Delta, American, Allegiant, United, Onejet, Alaskan, Virgin, Aeromexico, and Fedex use jet A fuel.
Fedex uses planes such as the Cessna 208B Grand Caravan, the ATR 42 and 72. All three of these planes operate on Jet A with an FSII (Fuel System Icing Inhibitor) called Prist.
I work at IND and we don't supply any Jet A-1