Has anyone ever used this? I came across it while using the NPR code when searching for a hotel in Boston. There are different levels of awards ranging from 15-35% room prices. The rates are great..$129 for Marriott Copley. Here is what the rate instructions say:

Rate rulesAdditional Information
AMERICAN AIRLINES ADVANTAGE AWARDS 35 PERCENT OFF
- BASED UPON AVAILABILITY
- CERTIFICATE REQUIRED UPON CHECK-IN TO QUALIFY FOR RATE

I called AA to see if I could exchange miles for a certificate, but they did not have this special going...could have just been the person I talked to.