I quite like that actually. I was never quite sure what C-Series meant; was it because it wasn't an A[irbus] or B[oeing]? And was it CSeries, C-Series or C Series? It was inconsistent, awkward to say, and didn't translate cleanly to other languages.
Bombardier have always been a bit rubbish at names so I can see why Airbus would want unambiguous clarity. If it's an A210 today it'll still be an A210 in 2030.
They're even worse with construction numbers, they assign each variant a numeric range out of a single sequence and hope they don't overrun each other. With the C-Series they jumped up to 50000 to try to escape from the encroaching CRJs.
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