"...more silent"? Do you mean "less noisy" ? That said, the Vanguard was a qualified success for Trans Canada Airlines, especially on the high-density Toronto-Ottawa-Montreal corridor. The "Mudguard" was a good stop-gap while awaiting the DC-9. Air Canada's selection of the DC-9 also offered a few aerospace jobs, as some DC-9 components were built in Canada, something no British-built jetliner could offer.