Welcome aboard JayA and welcome back to non-rev travel.
First of all TWA retirees now (after the merger TWA retirees did not receive any AA passes) have the same travel privileges as all other AA retirees; which means your great aunt and you, as her registered companion(RC) have unlimited fee-waived COACH travel. There are charges for First and Business class travel.
You are responsible for taxes, fees, surcharges levied by governments/airports.


Baggage - Non-revs are allowed two free checked bags(50lb ea. I think) - but I always advise to do only carry-on if possible


Paying for the trip - Once the flight segment is completed, your aunt the retiree, will be billed. Make sure her JetNet address is up-to date.
Billing is done monthly, so it could be a couple of weeks before she gets the invoice. BTW, they do assess late fees.


Imputed Income - Completely out my element as I just give everything to my accountant.
Fortunately, there is a section on imputed income on JetNet.


Pass Bank - Passes aren’t deducted until the flight segment is complete.


AA and US don’t have a single reservation system yet, but we will - eventually.


Of course your best source of info is JetNet. Take some time and read everything, starting with that Trip Book.


M7 has given you some valuable China travel info, post any additional questions in a new China Info thread. Post in the “Interline Travel” section, “Region Specific” Forum - “Australia/Asia/Oceania” Sub Forum. Bigger marquee, so more members will see it.
We do have some members that have traveled to China. You can also do a Forum ‘search’ for China info.
And when you get back, I want to hear all about this trip.

Mig