When people mention running parallel systems, I don’t really understand how this could work.
If you’re moving from one system belonging to RCCL to another you bought in (Verison Seaware is a system that is being used by other cruise lines & holiday companies), how can you run in parallel, unless that was agreed with RCCL (and why would they when you’re now a competitor.).
I can see that if a company is moving to new software and has to migrate their own data across to the new system, it would be entirely sensible to run both systems together until you are sure the new system is working properly. However in this case the data being migrated to the new system is from one company to another. Surely to run in parallel would mean RCCL continuing to take and manage Azamara bookings - that seems unlikely.