MONTREAL -- SkyWest Airlines, ExpressJet Airlines and their parent company have signed new 10-year, heavy-maintenance agreements with Bombardier Inc. (TSX:BBD.B).

The two airlines operate a total of 433 Bombardier CRJ Series regional jets for Delta Air Lines, United Airlines, American Airlines and Alaska Airlines.

The work will be performed at Bombardier's U.S. maintenance facilities including the Tucson Air Center, West Virginia Air Center and Macon Air Center.

Financial terms weren't announced.