Currently I have a 256GB rMBP from 2012 while my wife prefers her 128GB MBA from 2011. That said, she is running out of storage requiring me to constantly move photos from her computer to an external. I would estimate she takes ~10-15 GB of photos and video on her phone each month, even if most are duplicates. While she could be fine some of the photos, I would like to bump up the storage a bit. I am curious if the rMBP SSD would fit and function in a MBA? I have no concerns with the process of the swap, but would like to avoid moving data back and forth.