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US airlines surge but plenty of challenges still lie ahead

The 4 biggest carriers have seen their earnings spike but there are doubts about long-term profitable levels

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Major US airlines are facing a boon thanks to lower fuel prices and enjoying record profits, but doubts remain as to whether the industry can reach long-term profitable levels.

New York

MAJOR US airlines are facing a boon thanks to lower fuel prices and enjoying record profits, but doubts remain as to whether the industry can reach long-term profitable levels.

American Airlines, United Airlines, Delta Air Lines and Southwest Airlines - the four top US