Inspections Force Flight Cancellations

American, the nation's largest airline, canceled 132 flights of its estimated 2,300 flights scheduled for Thursday, spokesman Tim Wagner said. That was about 6 percent of American's Thursday schedule after the Fort Worth, Texas-based airline canceled 325 flights on Wednesday.

Delta has not specified the number of flights it was canceling Thursday. However, the Atlanta-based carrier said it began voluntarily re-inspecting wiring on 117 MD-88 aircraft on Wednesday night.

American said it began its inspections after an audit of the carrier by a joint team of inspectors from the Federal Aviation Administration and the Fort Worth-based airline. The inspections focus on proper spacing between two bundles of wires in the plane's auxiliary hydraulic system, and those wires must be installed exactly according to an FAA directive, American said.

American has completed inspections on 243 MD-80 aircraft, and about 45 planes "are still being worked on," Wagner said Thursday.

"We expect all but a few to be back in service by tomorrow," he said.

Delta expected heavy volumes Thursday at its hub at Hartsfield-Jackson Atlanta International Airport, spokeswoman Chris Kelly said. Both Delta and the Transportation Security Administration were bringing in extra staff to handle the crowd of travelers, she said.

Kelly said she didn't yet have estimates on how many passengers were affected by the flight cancelations.

Delta said its inspections are expected to be completed by Saturday.

The inspections come almost three weeks after the FAA ordered a check of all U.S. airlines' maintenance records. That was after controversy erupted over its handling of missed safety inspections at Dallas-based Southwest Airlines.