American Airlines said on Friday that it had repaired seat locks on 42 of 48 Boeing 757 jets after some seats came loose during flights last week, Reuters reported on Friday. The AMR unit, which filed for bankruptcy protection last year, said all 48 of its 757 jets that were to get the seat adjustments would be back in service by Saturday. The carrier had canceled 94 flights over Thursday and Friday to improve the locking mechanisms used to secure seats to aircraft floors. In recent days, three separate incidents occurred in which seats on American Airlines flights came unbolted from the floor, prompting an investigation by the FAA and jet inspections. American said an internal probe showed that improperly installed clamps had caused seats to loosen in six aircraft.