I have *G on Air NZ but will be starting over with a different airline this year and try to get up to G with them (either Thai, or UA, or AC – haven’t decided yet). I was wondering to what extent you can use one Gold card to obtain benefits while using another (entry level) to get points.

- I assume (?) that I can use the lounges, even if at check-in I have given a different FF number?

- Can I check in at the bus class counter?

- I have given my air nz ff number when booking my ticket for my next (SIA) flight from NZ to London but once I have signed up for another programme, want to change that ff number and have the points credited to the new programme. Can I do that when checking in?

Is there an advantage to this? For example if a flight is full and if you give them a *G number you’re more likely to get on but will they still let you change your number?

- Anything else I haven’t though of?

Thanks people!