The CRJ900 is a stretched 76–90 seat version of the CRJ700. The airplane is loosely based on the CRJ200 series with a few major improvements. The first CRJ900 (C-FRJX) was modified from the prototype CRJ700 by adding longer fuselage plugs fore and aft of the wings. It was later converted into the prototype CRJ1000 by replacing the fuselage plugs with longer plugs.
