DALLAS -- One year after an investigation of lapsed maintenance led to a crippling of airline operations across the country, federal regulators and carriers are struggling to balance regulatory scrutiny with the nonstop business of commercial aviation.
Fort Worth-based American Airlines has emerged as a persistent source of concern for regulators, who have investigated a string of problems that occurred since American grounded its largest fleet of aircraft last spring. One recent example: on some planes, American mechanics incorrectly reassembled pieces of a thrust reverser, which slows down a jet upon landing.
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