AliReza, are you sure about this? I was told by couple of people who fly and operate A320s that CFM56s are much better engines on that bird compared to V2500s. They were talking about reliability problems. Also, if memory serves right V2500 don't pack as much thrust as the CFMs do. Take care, BAHA ACUNER - CFI,CFII,MEI www.bahadiracuner.com www.acuwings.com although most A320 opperators prefer the V2500