News Summary: AA blames loose seats on clamps

SLIPPING AWAY: American Airlines says improperly installed clamps caused seats on at least two planes to come loose in recent days.

MORE INSPECTIONS: After first saying it would inspect the seats on eight Boeing 757 planes, American said Tuesday it would check 47 planes that have the same model of seat in coach cabins.

OUTSOURCING DEBATE: The Transport Workers Union, which represents American's mechanics, blamed the fiasco on outsourcing of maintenance work by American. The planes had been worked on by a contractor, Timco Aviation Services, which declined to comment. American said it was still trying to determine who installed the clamps.