I booked a flight on NWA from MSP-MSY originally operated by Mesaba/NWA Airlink. It's now showing as being operated by Delta, and the aircraft has switched from a CRJ900 to a "CM9". I can't even find a CM9 on Delta's list: https://www.delta.com/planning_reser...yout/index.jsp

Anyone know what a CM9 is? Is it the same as the CRJ?