I just typed that code in by accident, meaning instead to use A972200, and got very similar rates but with UNLIMITED mileage on the basic cars. I did a quick Google search which turned up nothing as far as what the code is for.

As for me, I used A972200 at a neighbourhood Toronto location without a hitch today. I managed to get a subcompact for $27.99/day (rack rate $46.80) and the 150 km per day didn't afect me as I was staying local with this car. I got the keys to a bug-splattered Accent hatchback with a shaky front end at highway speed. Got what I paid for I suppose.

I exchanged it at YYZ for an Elantra and again, no comment thus far.