Amazon.com: Odyson - 512GB SSUBX SSD (PCIe 3.0 x4) Replacement for MacBook Air 13" A1466 (Early 2015-2017): Computers & Accessories
How-To: Upgrade the SSD in your MacBook Air or Retina MacBook Pro, boosting size & speed - 9to5Mac
Amazon.com: PCIe SSD to M.2 NGFF M Key Adapter Card for 2013 2014 2015 2016 MacBook Air Pro Retina, Hard Drive Converter to Ngff M2, Support Model A1465 A1466 A1398 A1502: Computers & Accessories
How To: Replace the SSD in your MacBook Air 13" (Early 2015) - YouTube