Originally Posted by TMOTEE
I too switched from DL Platinum to CO this year. Since CO & DL are partners you will have to do an extra step. I got a status match on UA to their mid level then used that to get a status match on CO at Gold Elite. You drop one level but if you fly a lot then you will regain Platinum on CO. At least this worked for me this year.
As stated above, OP is EXP with AA, so absolutely no need to do anything other than request a status match to CO Plat based on his AA status. There are other threads that have the fax No. for CO status match. I can't do a search at the moment, but if you search, you should find it.