Fuel price actually used in the industry
Jet Fuel is not listed on the commodities exchange, at least not according to this list. For what its worth small boats use regular car gas or diesel fuel and some larger ships are powered by fuel oil but they use boilers as opposed to a reciprocating engine like on smaller boats. Small boat gas tends to command a higher price because it can not because its any different than car gas. This is largely because you cant pull a big boat and take it to the gas station to fill it up every time you need fuel. AvGas for piston pounders is 110 or 100 octane low led. This is every similar to car gas (but higher octane and leaded). It is more expensive since it is taxed differently. Jet Fuel is effectively kerosene. 

In the end of the day these are all crude oil byproducts so if you are looking for a commodity price the price of crude oil will effect the price of aviation fuels the same way it effects the price of car and boat fuels. Crude oil prices are about as close as you are going to get.