I have flown from Sydney to Shanghai about 4 times in the last 18 months, each time with Qantas except 1 leg, which was with China Eastern. I am going again next month and was wondering would it be worthwhie going from Sydney to Osaka with Jetstar in Starclass, then a Oneworld partner airline connection to Shanghai. I know it will take longer than the direct Qantas flight, but Starclass is hopefully better than economy for a fraction of a business class ticket. I normally fly economy due to company budget, but upgraded to Business once using FF points. How would I go about booking this? Any other suggestions would be greatly appreciated.