Delta spokesman Anthony Black said it isn't known yet which regional airline will fly the new planes, or which ones will be losing the 50-seaters. Delta will still have 226 of those CRJ-200s, even after it sends 60 back to Bombardier.
Delta also has another 154 larger regional jets that have first-class seats.
Delta said this fall that it was looking for 76-seat regional jets. It's a big win for Montreal-based Bombardier, whose small-jet regional jet business has been in the doldrums as other airlines also shift away from 50-seaters.
Shares of Atlana-based Delta Air Lines Inc. rose 27 cents, or 2.7 percent, to $9.98 in afternoon trading.
AP Business Writer Michelle Chapman in New York contributed to this report.