1.   They were noticed during routine maintenance checks.

2.   Because ValuJet flies older aircraft, maintenance checks are already stiffer than for newer planes, officials said.

3.   Between takeoffs and landings, the flight crew does a walk-through maintenance check.

4.   Boeing officials say there is generally no call to remove the fasteners during routine maintenance checks and that operators are instructed to visually inspect the parts.

5.   But in a letter to the Security Council Thursday, he blamed an accident during a maintenance check of short-range Iraqi missile engines for the damage.

6.   Denton said most of the changes could be done by airlines overnight during maintenance checks of the aircraft.

7.   For the next four days, the airplane will undergo maintenance checks and ground tests before making its second flight.

8.   In recent days, officials have promised analysts a few pleasant surprises, even though the company interrupted production in the spring for biannual maintenance checks.

9.   Luke already had boosted maintenance checks, as well as the criteria for passing inspections.