Question: what is the difference between jet a and jet a1?
Answer: 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). ... Many years of experience have shown that Jet A is suitable for use in the United States.