lcloo
Captain
Not true.Does it mean only 5 airports in the world have the ground support capability for C919? I think this factor also contributes to the low sortie rate. The other big factor will be limited availability for qualified pilots and air crews.
C919 had landed in airports in Singapore, Malaysia, Vietnam, Thailand and Cambodia. And it had landed in many other airports during its flight testings.
And you don't train your pilots and air crew at the last minutes. It takes many years from signing of purchase contract to delivery of aircraft. And a competent airline would have send their pilots and aircrew to Shanghai COMAC base for training after signing of contract. And if their failed to do so, they are not worthy of being an airline operator.