December for the initial route (which will replace a current service) and January or February for the new, new route

QF19/20 during peak months is the highest load factor route in the Qantas international market. It was 98% las January 

They use the 3 Class 77W to Sydney (and same will go for Melbourne) So Economy, Premium Economy and Business only. The 4 Class is only used on longer flights to places like New York