A-Tech 16GB Kit (2x8GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
MacBook Air (11-inch, Mid 2013) - Technical Specifications
Amazon.com: Odyson - Logic Board 1.6GHz i5 (i5-5250U), 4GB RAM Replacement for MacBook Air 11" A1465 (Early 2015) : Electronics
Apple MacBook Air Mid 2013 Core i5-4250U @1.30GHz 4GB RAM 256GB SSD BIG SUR – ASA College: Florida
MacBook Air 16GB RAM Upgrade - YouTube
MacBook Air 13" Mid 2013 Teardown - iFixit
Upgrading RAM on a First Generation MacBook Air - YouTube