Apple MacBook Air 13-inch 2015 Laptop MJVE2LL/A, 1.6GHz Core i5, 4GB RAM, 128GB SSD Pre-Owned Silver A1466 - Best Buy
MacBook Air 13" Early 2015 Teardown - iFixit
MacBook Air 13" (2015) - QWERTY - English (US) Core i5 - 1.6 GHz - SSD 128 GB - RAM 8GB | Back Market
MacBook Air 13.3" 1.6GHz Logic Board, 4GB, Early 2015 - 661-02391
How-To: Boost your Mac's speed and prolong its useful life with easy RAM upgrades - 9to5Mac
MacBook Air 11-inch (2012) teardown reveals upgraded hardware, same battery/internal design - TechRepublic
Is there a way to upgrade the RAM in an early 2015 MacBook Pro without voiding the warranty? - Quora
MacBook Air 11" Early 2015 Teardown - iFixit
MacBook Air (13-inch, Early 2015) - Technical Specifications
MacBook Air 13" Early 2015 SSD Replacement - iFixit Repair Guide
I just bought a second hand macbook air 2015 11 inches (i5 4gb ram) and I'm shocked how well it runs for basic office writing and scientific data analysis use. : r/mac