Hertz/AVIS and AU card

I was looking on my new Au card today and it has codes for AVIS and Hertz on the back. Does anyone know what they are for?

They are not included in as an Au benefit on the FC pages. Just curious as to whether they unlock a new world of adventures.

They are there so you get some extra discounts on those suppliers.
Pretty sure you get miles per booking as well. I haven't used Hertz for well over a year as our Corp went to Avis.
Don't get excited about the rates you will get. I have tried them a few times and got a lot better using other codes.

[Neil]

As above, it's a 'discount code', but more often than not there are better offers or codes out there to use anyway.