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
Absolutely Insane Battery Life - The 2013 MacBook Air Review (13-inch)
Refurbished 2015 Apple MacBook Air 13 Inch Core i7 2.2GHz 8GB RAM SSD MMGG2LL/A
Logic Board 2.2GHz i7, 1.6GHz i5, A1466 MacBook Air 13" Ram 8GB, 4GB Early 2015 | eBay
13" Apple MacBook Air 1.6GHz Core i5 256GB SSD 4GB RAM (2015) - MacUnited
Apple MacBook Air 13" 2015 Silver - i5 1.6GHz - 4GB RAM - 256GB SSD - Model Number MJVG2LL/A - Grade B Refurbished - Walmart.com
Review: The 2015 MacBook Air's once-trailblazing design is showing its age | Ars Technica
Amazon.com: Odyson - Logic Board 1.6GHz i5 (i5-5250U), 4GB RAM Replacement for MacBook Air 11" A1465 (Early 2015) : Electronics
Macbook Air 13" A1466 2017 16GB Memory Upgrade - YouTube
Can we upgrade the memory (RAM) of the Macbook Air early 2015 model? - Quora