UPDATE 1-American Air says seats fixed on most 757s needing repair

(Updates number of repaired planes)

Oct 5 (Reuters) - American Airlines said on Friday it hadrepaired seat locks on 42 of 48 Boeing 757 jets after some seatscame loose during flights this week.

The AMR unit, which filed for bankruptcyprotection last year, said all 48 of its 757 jets that were toget the seat adjustments would be back in service by Saturday.

The carrier had canceled 94 flights over Thursday and Fridayto improve the locking mechanisms used to secure seats toaircraft floors.

"We have identified the issue and our maintenance teams aresecuring an FAA (Federal Aviation Administration)-approvedlocking mechanism to make sure no seat can be dislodged,"American spokeswoman Andrea Huguely said in a statement.

In recent days, three separate incidents occurred in whichseats 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 installedclamps had caused seats to loosen in six aircraft.

Fort Worth, Texas-based American Airlines has just over 100757 planes, but only 48 use the seat model that has causedproblems.

American Airlines and its pilots union resumed contracttalks on Wednesday, but other problems continued at the bankruptcarrier this week.

A cockpit warning light caused an American flight to returnto an airport shortly after takeoff on Tuesday, while a courtsaid a union-organizing drive at the airline could go forwardand flight delays brought more customer complaints.

(Reporting by Karen Jacobs in Atlanta; Editing by Gary Crosse,;Gerald E. McCormick and Dale Hudson)