Once I finally ticekt my DONE4 this month (after having to change from CMB to NRT ) I will have a number of QF domestic sectors that will be open.
They are: ADL-PER-BNE-MEL.

I will make a one way eco. booking to get from MEL-ADL to start. Am I able to just turn up are MEL airport and ask to get on the next flight with D class seats available from ADL (that connect with my arrival from MEL)?

If I call the QF call centre to have the flights added to the ticket, do I need to pay the over the phone booking fee?

Lastly, on check-in in MEL I will be in economy, but connecting in MEL to business class. Will they tag any luggage (if there is any) through as business class, as they are on seperate reservations. Also, when traveling back from BNE to MEL, being an international ticket, with the US on it, I get the 2 pieces at 32kg a piece right (or does a higher QF business class allowance apply?) I will be picking up some things in BNE and will actually need all of the allowance I can get on that leg!

Thanks.
john