American Airlines on Saturday returned its entire fleet of MD-80s to service and operated a full schedule. The FAA last week grounded the planes, a move that forced American to cancel about 3,300 flights. Each plane was checked by American mechanics and approved by an FAA inspector. In addition, American has hired an independent firm to review its methods for complying with FAA safety directives. The airline has said the canceled flights may cost "tens of millions of dollars."
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