Fuel is usually the second-highest expense for an airline next to labor. Therefore, fuel price increases are a major contributor to rising operating costs in the airline industry. The FAA forecasts fuel costs will remain high for the next several years. Neeleman seriously considers fuel costs and is investigating alternative sources of energy, such as liquid coal. Because the United States has an abundant supply of coal, Neeleman is urging his customers to support a new bill to fund additional coal-to-liquid plants. Airlines engage in fuel hedging in order to manage unpredictable costs. However, the jet fuel commodities market is illiquid, and it is especially difficult for the large airlines to hedge sufficient quantities of fuel. JetBlue is increasing its efforts to systematically hedge against future fuel needs. JetBlue also seeks more efficient fuel usage through the planes purchased and improved flight planning.