Mesaba Aviation (now Endeavor Air), operating at the time as Northwest Airlink (now Delta Connection), was the launch customer, and remains the largest operator of the CRJ900 NextGen.
Mesaba Aviation, operada nese momento como Northwest Airlink (agora Delta Connection), foi o cliente de lanzamento, e egue a ser a aeroliña con máis unidades do CRJ900 NextGen.