The main problem with the SSJ-100 seemed to be the complete lack of engineering support and access to spare parts once the aircraft was operating outside the Russian sphere. Aircraft could be grounded for lengthy periods if a technical fault arose ... faults which could be rectified quickly on a Western type with abundant spares to hand. This seemed to be the main problem encountered by Interjet in Mexico; I understand that Cityjet had issues too. If Comac wish to make inroads into markets beyond Russia, they need to learn the lesson from Sukhoi's experience. There needs to be a supply line linking overseas fleets with ready access to spares and engineering support.