That is not a simple answer to give, but I will do my best.

First, some of the numbers represented as CC AWD numbers are not numbers for CC.

Second, since CC is the "holy grail" of sorts at Avis, a lot of people use numbers which they are not entitled to use, which requires the improperly used numbers to be put on watch by Avis security, or outright cancelled and replaced.

Third, there are a variety of ways to become CC, and as best as I can determine, each of those may have its own applicable AWD. For example, corporate CC members, such as CEOs of major corps which have a contract with Avis, might have an AWD number which is specialized for only CC members from that company. There would also be AWD numbers for people who buy CC directly from Avis on a year over year basis, and more AWD numbers for people who obtain CC through a membership program such as Marquis Jets or AMEX Centurion.

Fourth, there could very easily be other AWD numbers for other reasons not already noted, but those are all the reasons I can think of at the moment.