St. Louis-based regional carrier Trans States Airlines canceled 12 flights last night and at least 40 more today to check nosewheel steering mechanism relay switches on its Embraer ERJ 145s. The internal audit comes as the FAA continues a sweep of U.S. airline inspection records that most recently saw thousands of flights canceled by American Airlines last week.

Trans States vice president of marketing and planning Bill Mishk said the airline this morning returned to service 12 of the 24 airplanes under scrutiny and planned to finish all the inspections by this evening. The cancellations involved American Connection and United Express flights, mainly out of St. Louis. The airline also canceled “a few” United Express flights from Chicago, but none of its US Airways Express service.