The Macbook Air Early 2014 has an 802.11n wi-Fi standards which is better than most portable PCs that have been available for around the same time as it. Most comparable spec laptops that have been on the market for around the same time as it have an 802.11a wi-Fi standards. In addition, this notebook PC have 802.11ac and 802.11b and 802.11g wi-Fi standardss.
An 802.11n wi-Fi standards is actually the best Wi-Fi standard amongst all laptops of a comparable age and spec to the Macbook Air Early 2014.
The worst Wi-Fi standard amongst comparable types of laptop is 802.11a.