Thanks, but what are stackable PC codes? do you know of any that will work in Europe this summer?

This one seems pretty good. What is it from?

Comes up as ALLIED BUSI NETWORK INSTANT ID

A PC I have often used in the US ,,,, PC #129780,15% off rentals of 5 days or more,,,,it often worked out marginally less than using only my AAA CDP

The best discount I can find is the 15% off with either Amex Platinum or AAA. Unfortunately I don't have an Amex Platinum or AAA card to present at check-in. Is this a problem?

If so, is there any 15% off CDP code where I won't have to show any id/card?

That could be a problem since some counters do check especially the AAA. Do you have a United or any other loyalty programs? Most have CDP of up to 20% along with PC codes.

(CDP) 1859906 must be included in reservation
 

The best rate I could find for a recent trip to LAX was (CDP)1859906, this must be included in reservation to receive rates and benefits. I have preloaded into my Hertz Gold profile- you also must be a public sector or non profiy employee.

What ID do they require if you preload it into your Hertz Gold file?

The AMEX codes seem to give decent discounts - will they actually ask for an Amex card when you show up?

Bump - so when using a CDP code, what are the chances that they will ask for related documentation, such as Amex card?

I haven't ever been asked for documentation of any of the CDPs that I have used. But I'm a Gold member, so really only have to talk to somebody for a few seconds before taking the car away.

Very low I'd say. Out of the 100s of rentals I've done only once did a jerk at MCO bothered me for one, which I actually did have.

Cdp #1910304
 

BIG SAVINGS code. up to 40% off daily rental rate. I've averaged between 20 and 30%

The BIG SAVINGS CDP actually priced up my rental $30 more than using the Marriott 10% CDP. I guess it wasn't valid for the rental I was trying

FYI Each AAA club has a different club number prefix which is the CDP for your car rental and a different deal for each different state club. Each state has a different price and not all AAA rentals are the same low price. They always ask for my card when I use Hertz AAA discount. I had to use my Parents card when I was in NY because my Texas AAA would have been much more to rent in NY> Best AAA discount is in your own state! Buyer beware. The best discounts are the VISA discounts.