NO ES COMPATIBLE CON MACBOOK AIR DE NINGUN AñO.ES COMPATIBLE CON:Compatible with MacBook Pro Retina 15" A1398MacBookPro11,4 Mid 2015 (IG): MJLQ2LL/A (2.2 GHz Core i7)MacBookPro11,4 Mid 2015 (IG): MJLQ2LL/A (2.5 GHz Core i7)MacBookPro11,4 Mid 2015 (IG): MJLQ2LL/A (2.8 GHz Core i7)MacBookPro11,5 Mid 2015 (DG): MJLT2LL/A (2.5 GHz Core i7)MacBookPro11,5 Mid 2015 (DG): MJLT2LL/A (2.8 GHz Core i7)iMac 21.5" A1418iMac18,2 Mid 2017: MMQA2LL/A (2.3 GHz Core i5)iMac18,2 Mid 2017: MNDY2LL/A (3.0 GHz Core i5)iMac18,2 Mid 2017: MNE02LL/A (3.4 GHz Core i5)iMac18,2 Mid 2017: MNE02LL/A (3.6 GHz Core i7)iMac 27" A1419iMac18,3 Retina 5K Mid 2017: MNE92LL/A (3.4 GHz Core i5)iMac18,3 Retina 5K Mid 2017: MNEA2LL/A (3.5 GHz Core i5)iMac18,3 Retina 5K Mid 2017: MNED2LL/A (3.8 GHz Core i5)iMac18,3 Retina 5K Mid 2017: MNED2LL/A (4.2 GHz Core i7)iMac 21.5" A2116iMac19,2 Retina 4K Early 2019: MRT32LL/A (3.6 GHz Core i3)iMac19,2 Retina 4K Early 2019: MRT42LL/A (3.0 GHz Core i5)iMac19,2 Retina 4K Early 2019: BTO (3.2 GHz Core i7)iMac 27" A2115iMac19,1 Retina 5K Early 2019: MRQY2LL/A (3.0 GHz Core i5)iMac19,1 Retina 5K Early 2019: MRR02LL/A (3.1 GHz Core i5)iMac19,1 Retina 5K Early 2019: MRR12LL/A (3.7 GHz Core i5)iMac19,1 Retina 5K Early 2019: BTO (3.6 GHz Core i9)IDENTIFYING NUMBERSApple Part #:661-07313, 661-07314, 661-07315, 661-12550, SM0256LPrinted Part #:655-1993A, 655-1993C, MZ-KPW2560/0A2, MZ-KPW2560/0A4, MZ-KPW2560/0A6