US airlines are hedging more of their jet fuel as prices and volatility remain high,and credit ratings improve.Jet fuel is the largest variable cost for most airlines.International airline association IATA estimates that oil price rises this year will cost the global airline industry 25bn more than last year.But hedging activity fell in 2002,as US airlines were pushed into bankruptcy by the effects on air travel of the 11 September attacks in New York and Washington.
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