Audio Formats Supported?

I have been reading the owner's manual and am a bit confused as to what audio formats are supported by the CD player. I see the USB port supports MP3 and WMA. I see references to MP3 support on the CD section, but I have tons of CDs that are AAC format. Can the Cruze CD player handle these or do I have to burn new CDs for the car in MP3 format? It would be nice if I could just drop my current audio library onto a memory stick, but it looks like I will have to create an MP3 only library for that purpose. Thanks.

Jim