I was looking at some hotel rates and found one for a "US Air Deluxe Room." Here are the rate rules:

Rate Rules
Guarantee Policy
A CREDIT CARD NUMBER IS REQUIRED TO CONFIRM OR GUARANTEE YOUR RESERVATION
Cancellation Policy
CANCELLATION PERMITTED
- BEFORE 1800 DAY OF ARRIVAL
74.69 USD CXL FEE
RateInformation
WRITTEN AUTHORIZATION REQ
FAX TO 773-714 4285
CERTIFICATE REQUIRED AT CHECK-IN
MUST STAY OVER NIGHT OF
- FR OR SA
Rate Information
US AIR 50 PERCENT OFF
REQUIRES FRIDAY, SATURDAY OR SUNDAY STAYOVER
Tax Information
CURRENCY RATES QUOTED IN USD - US DOLLAR AND EXCLUDE TAXES
TAX 14.900 PCT/ROOM PER NIGHT

What's the deal here? Will a USAir Dividend Miles card do, or do I really need some kind of certificate? Any insight would be helpful!!!