"Hi! I'm travelling MEL-SYD on QF 187 economy class. QF 187 will continue to HKG from SYD as an international flight. I'm OW Emerald (Finnair Platinium). As this is a domestic flight, can I have access to QF lounges and if I have can have acces to First class lounge."

Yes, you will be able to visit the 1st class lounge

Dave

"Also any information, is it possible to upg this with using cash and is it worth it. I'm travelling on N class ticket."

Yup. Pay the difference between the economy class fare and the business class fare ... If you mean , can you get a cheap upgrade, then no you cannot.


"And, where should I check-in. First class international???"

Indeed you should.

Do make sure that you have photo id with you since you are travelling out of the international terminal

Dave