I have been platinum for several years on my own travel, and before that I was gold briefly with alot of domestic travel. It's really a mixed bag, so make sure to check that the reality of what you're thinking your getting matches up with your expectations.
I felt as though the domestic business lounge access was one of the best things when travelling domestic. But the domestic business lounges offer no benefit over the QANTAS club lounges anymore. They used to operate a kitchen, and they do again now, but you'd be lucky to see anything appetizing. The spread in the buffet is barely worth a glance anymore. We're talking brekky without bacon, and make your own sandwhich for dinner.
As I started to travel more internationally, I discovered some of the international first lounges and was pleasantly surprised with the menus, and I still am. But since Covid hit, the drinks selection is a bottom of the barrel selection. I.e. Chivas 12.
Service in the lounges can be a mixed bag. I strongly questioned the value of the program when I recently flew from MEL-BKK on JQ, and was all but ignored by the service staff standing idly 2 metres away from me. However, on a more recent SIN-BNE flight, the service was excellent. Another AFF'er commented to me that they may be discriminating your treatment in the lounge based on your ticket type. I personally think it was just a once off.
The spas in the SYD and MEL first class lounges were great prior to Covid, and you could make a guaranteed booking if flying first class, or otherwise you get what's left when you arrived. You'd be lucky to get a spot at the best of times. But in any case, they still haven't reopened.
There is also a very noticeable lack of any OneWorld lounges at locations like Jakarta, Denpasar, Christchurch, etc. Brisbane international doesn't have any first class lounge at all, because there is no first class service out of that airport. I've attached a picture showing which airports have OneWorld first class services. But that doesn't necessarily mean that they all have first class lounges.
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If you're planning on getting status because you also fly Jetstar, it's a mixed bag. So, think carefully before planning on getting any status at all. Quite often the airports that Jetstar fly in and out of, don't have lounges at all, or they're in a different terminal. A few examples.
BNE - For now they both operate in the domestic terminal.
BKK - No more QANTAS lounge.
CNS - QF has a domestic lounge, but there's nothing international. Again, you can walk between them if you have a long layover.
MEL - Different terminals for domestic flights, but you can walk between them if you have a long layover.
SIN - JQ is moving to T4 and QF is staying in T1. Totally out of reach.
SYD - Different terminals for domestic flights, but you can walk between them if you have a long layover.
I wonder if anyone has a spreadsheet or some kind of document showing the mapping of Jetstar and QANTAS to airports and terminals?
Hope this helps as a balanced commentary on why you might want to, or not want to have QANTAS platinum status.