How-To: Upgrade the SSD in your MacBook Air or Retina MacBook Pro, boosting size & speed - 9to5Mac
Apple MacBook Air (13-inch, June 2013) review: A familiar MacBook Air, with an all-day battery - CNET
Amazon.com: MCE Technologies 1TB Internal SSD Flash Upgrade for MacBook Pro Retina (Mid 2012 - Early 2013) - Includes USB 3.0 Enclosure for Original Drive & Install Kit! : Electronics
How to use an NVMe drive to upgrade your Mac's SSD | AppleInsider
MacBook Air 13.3-inch (2013) - Core i5 - 4GB - SSD 128GB | Back Market
Teardown of New Mid-2013 MacBook Air Reveals Smaller SSD, Increased Battery Capacity - MacRumors