It's
* preferred
* avisfirst (formerly preferred select)
* presidents
* chairmans

presidents isn't generally awarded based solely on frequency of rentals (though there are reports here of some members successfully petitioning for it).. a certain # usually come with large corporate contracts. amex centurion and the newer high-end continental mastercard come with it as well.

chairman's has recently been expanded to some high volume renters that are also decision-makers on corporate contracts (with a fee!). also comes with marquisjet ownership... and a very limited # with large corporate contracts as well.

CHM status is great by the way