CHICAGO--(BUSINESS WIRE)--Looking beyond the early indications of stabilization in the U.S. airline industry operating environment, the sector remains fragile and highly sensitive to changes in air travel demand and the price of jet fuel, according to Fitch Ratings\' Fall 2009 Airline Credit Navigator released today. Following a period of extreme revenue pressure driven by the collapse in premium air travel demand over the past year, U.S. airlines enter the fall with growing expectations that sti
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