Bombardier Inc. jets flown by regional airlines were issued operating restrictions by U.S. and Canadian aviation regulators because of problems with wing flaps on hundreds of older planes.

The U.S. Federal Aviation Administration and the Transportation Safety Board of Canada separately issued new regulations for maintenance, crew training and dispatching for the CRJ100, 200 and 440 jets, the FAA said in a statement issued last week. There are 684 such planes registered in the U.S.

The aircraft seat 40 to 50 passengers and are used by regional carriers such as Air Wisconsin Airlines Corp., Atlantic Southeast Airlines Inc. and Skywest Inc., the FAA said. The agency's directive goes into effect Sept. 5.