Delta Air Lines and American Airlines cancelled some of its flights to run safety inspections on MD-88 and MD-80 aircrafts made by St. Louis-based McDonnell Douglas, and its now Chicago-based acquirer, Boeing Co.

Delta, which has flights to Sacramento International Airport, said Thursday it's canceling 275 flights through early Friday so it can run safety inspections on wiring in 117 MD-88 aircraft.

"Delta is working in full partnership with the FAA and is proactively and voluntarily revalidating the full compliance of a prior airworthiness directive completed earlier this year," the airline said in a statement.

"We expect this voluntary review, which is taking place on Delta's 117 MD-88 aircraft, to result in approximately 275 cancellations through early Friday, impacting about 3 percent of Delta's worldwide flight schedule. Based on the aggressive and proactive re-inspection schedule, Delta expects inspections to be complete on approximately 70 percent of its MD-88 fleet by early evening, with normal operations planned by early Friday."

On Wednesday, American Airlines grounded its MD-80 aircraft and canceled more than 200 flights to conduct further inspections, with most of the affected flights departing from Dallas-Fort Worth International Airport and Chicago O'Hare international Airport.

A maintenance audit conducted jointly by the airline and the Federal Aviation Administration raised questions "regarding an already accomplished directive" concerning how a certain bundle of wires is secured to the MD-80s.

The Fort Worth, Texas-based airline said it is re-inspecting the MD-80s to ensure that wiring is installed and secured properly.