The MacBook Air Early 2014 has an 802.11n WiFi standard which is better than most laptops that are a similar age to it. Most similar spec notebook PCs that came out around the same time as it have an 802.11a WiFi standard. This Apple laptop also have 802.11ac and 802.11b and 802.11g WiFi standards.
This notebook PC's Wi-Fi standard (802.11n) is in fact the best Wi-Fi standard across all notebook PCs of this age and type.
An 802.11a WiFi standard is the worst Wi-Fi standard amongst comparable types of notebook PC.