There is a connection called mSATA, which allows a mini pci-e plug to double as a IO port. Nearly all ultra-books use this connector, and there are many good SS

There is a connection called mSATA, which allows a mini pci-e plug to double as a IO port. Nearly all ultra-books use this connector, and there are many good SSD products that use it. Apple have continued to change their adapter in different revisions, depreciating many lines of third-party SSDs for Airs. While mSATA may not have been in common use when the Air was created, it is now incredibly common.