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MC503LL/A is the sales number for the MacBook Air 13.3" 1.86GHz Core 2 Duo.
This model was first released on October 20th, 2010 and was discontinued on July 20th, 2011.
Apple Parts for MacBook Air 13.3" 1.86GHz Core 2 Duo (MC503LL/A)
* - Denotes that we sell an alternate part instead of the actual Apple product.