WASHINGTON — Airports will suffer from American Airlines' decision to lay off about 4,400 employees in the coming days because that action will "inevitably" lead to fewer flights and less revenue for the sector, Moody's Investors Service warned Monday.

American announced last week that it had sent layoff notices to 11,000 employees, though the airline said it intends to cut only about 40% of those notified. Federal law requires that notices be sent to any employee whose job might be eliminated.

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