DALLAS (AP)  American Airlines canceled 850 more flights on Wednesday as it reinspected the wiring on its MD-80 jets.

An American spokesman, Tim Wagner, says 208 of those flights canceled Wednesday are at the carrier’s main hub at Dallas-Fort Worth International Airport. The nation’s largest carrier canceled nearly 500 flights on Tuesday.

It is the second wave of cancellations at American over the same issue. American is inspecting and  if necessary  reworking wiring bundles on its MD-80 aircraft to comply with federal safety rules.

The airline operates about 2,300 daily flights. Airline officials say passenger safety was never compromised.