If you work on the mainline fleet being 747/A330 you will receive approx $1400.00 per fortnight after tax you will also be paid the incidental payment for block hours flown at approx $3.00 per hour. There are not a lot of routes where overtime would be paid therefore to be on the safe side you can bank on the $1400.00 per fortnight plus allowances in local currency. After year 1 the base salary increases slightly.
On the A380 fleet as this is flown to long range routes you will be paid overtime on just about every trip therefore your base pay remains the same $1400.00 after tax plus incidental payment and overtime therefore if you did 2 trips in a pay period your could expect to receive in your bank account anywhere from $1600.00-$1800.00 per fortnight maybe more but you have to remember the only consistent component will be your base pay. On top of that allowances paid in local currency.
In regard to allowances its very complex to explain as it is calculated on Breakfast, lunch, dinner and snack with a total if you were in a slip port covering all those meals. However the business provides meals onboard say inbound and outbound to/from a slip port therefore you may only receive part of the total payment. AUD $200.00 per day is about right if you are on the A380 fleet the average I would say is between $150.00-$200.00. Remember you have to pay for all your food, drinks, etc etc from the allowance and suffer exchange rate losses or profits when you convert your allowance back to Australian dollars.
As an example if you were on a 4 Day Los Angeles trip you will receive approx USD $135.00 for your entire stay that is approx AUD $180.00 deduct your expenses while up in Los Angeles.
On a 3 day Singapore trip depending on arrival time you will receive approx SGD $119.00-$210.00 if we take the max allowance for a 3 day trip being SGD $210.00 that is AUD $199.00 again you will need to deduct all your expenses while in the slip port.
Allowances vary greatly depending on aircraft fleet and your destination therefore be very careful trying to work these into your calculations when working out your cost of living etc. Some fortnights and months you may get great allowances and overtime others not so much.
I hope this basic information helps. At the end of the day it is a fantastic career working with the best airline in the world and the opportunities for future promotion are there but its important you go in knowing some basic facts. Once again good luck.