ive heard from many people that this is athens and caribbean blue.
is there a difference?
the color code is B21.

 

Looks like AB to me!

 

Took me about 7 seconds to find this:

2006
AY2-Garnet Fire
B21-Medium Blue
B30-Lakeshore Blue
BW5-Twilight Blue
K23-Liquid Platinum
K32-Serengeti Sand
KH3-Black Obsidian
QX1-White Pearl
WV2-Diamond Graphite

2005
KY0-Brilliant Silver
B21-Athens Blue
B30-Lakeshore Slate
QX1-Ivory Pearl
K32-Serengeti Sand
AX6-Laser Red
KH3-Black Obsidian
WV2-Diamond Graphite

2004
KY0-Brilliant Silver
B16-Caribbean Blue
KX6-Desert Platinum
QX1-Ivory Pearl
AX6-Laser Red
KH3-Black Obsidian
WV2-Diamond Graphite
BW5-Twilight Blue

2003
QX1-Ivory Pearl
KY0-Brilliant Silver
KX6-Desert Platinum
B16-Caribbean Blue
AX6-Laser Red
KH3-Black Obsidian
WV2-Diamond Graphite

EDIT: they are missing the best one, D10!!

 

^^ You used the search button. No Fair!!

 

thanks! i was right i have an 05 so its athens blue.