In December 2012 , Delta Air Lines ordered 40 CRJ900 NextGen worth $1.89 billion with 30 options .
In June 2010 , Lufthansa ordered eight CRJ900 NextGen .
In December 2012 , Delta Air Lines ordered 40 CRJ900 CRJ900 NextGen worth $1.89 billion with 30 options .
In June 2010 , Lufthansa ordered eight CRJ900 NextGen .