The new 2018 MacBook Air is essentially the 12-inch MacBook, made larger.

Apple says the MacBook Air is “the most beloved notebook ever,” and it’s not wrong. The huge success of the original Air had ripple effects throughout the industry, but it has languished in recent years. For the last three years or so, Apple had kept up with neither technological nor design advances in its most important laptop.
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https://www.macworld.com/article/3318566/macs/macbook-air-2018-review.html