Qantas business class lounge access with connecting economy flight?

I am travelling in Business Class on Qantas from Adelaide to Sydney and have a connecting economy flight from Sydney to LA. Am I allowed to use the Business Lounge in Sydney?

Sorry if it's a silly question, thanks.

Do you hold any status with Qantas or have Qantas Club membership?

No you can't unless you hold any status with Qantas, have QC or status from another OW airline as Martin has mentioned above.

Alcoano,

There are rules in place around lounge access when one leg is in Economy and the other in Business/First. The rule follows that access to the lounge prior to the shorter/domestic sector flight in Economy is available  when the longer/international sector has been/will be flown in Business/First.

In your case however, the longer/international sector is in Economy, which means that the provisions do not apply i.e. you cannot use the lounge in SYD prior to the LAX flight.

Correct - the class of travel for the long haul international flight (over 5 hours) is the deciding factor.

If the OP were travelling Y ADL-SYD then J SYD-LAX, they would have lounge access at both ADL & SYD.

No

Lounge Entry is based on the next onward flight. However you can ask......if the lounge is not full, you never know your luck unless you try