American Airlines was working Thursday to rebook customers as one of its regional carriers grounded most of its planes.
American subsidiary PSA Airlines had canceled 194 flights as of Thursday afternoon, according to flight tracker FlightAware, under the American Eagle name.
"Out of an abundance of caution, PSA Airlines has temporarily removed most of its aircraft from service in order to complete a necessary, standard inspection on the nose gear door," American spokesperson Derek Walls told USA TODAY. "We are working with PSA and the (Federal Aviation Administration) to immediately address the issue. We are working with our customers to arrange new accommodations on other flights, and we are working to return the impacted aircraft to service."
The FAA said in a statement that the carrier removed a number of its Bombardier regional jets from service after discovering a maintenance issue that the airline voluntarily disclosed to the agency.
PSA wrote in a tweet Thursday: "Most of our aircraft have temporarily been removed from service to complete a standard inspection. We’re working to resolve the issue and sincerely apologize to our customers for the inconvenience."
According to its website, PSA Airlines operates an all Bombardier fleet including 130 CRJ700 and CRJ900 aircraft.
"We’re working to accommodate our mutual @PSAAirlinesInc customers as quickly as possible," American Airlines wrote in tweet Thursday afternoon, noting that customers are able to check flight status online.