Canadair is not an airline, it's a type of aircraft.
The flights are most likely operated by one of the "Delta Connection" carriers (Atlantic Southeast Airlines, Chautauqua Airlines, Comair, Freedom Airlines, Shuttle America, SkyWest). These small carriers usually operate regional routes in a partnership agreement with the big airline. For example, you can purchase your tickets from Delta, check in at a Delta ticket counter, and even have a Delta flight number, but the flight will actually be operated by (example) ComAir, in a plane that is owned or leased by ComAir, with crew members that fly for ComAir, instead of Delta.
The CRJ jets are very small, and, in my experience, not very comfortable for long flights. (About 2 hours is probably the longest I'd want to be on one of those planes, and even that's pushing it a bit). They are fairly reliable, just not very comfortable.