The Latitude 14 E7440 has a better Wi-Fi standard than most ultrabooks that were released around the same time as it. This notebook PC has an 802.11n wi-Fi standards, whereas most portable PCs of this spec and age have an 802.11g wi-Fi standards. In addition, this portable PC have 802.11a and 802.11ac and 802.11b wi-Fi standardss.
This portable PC's Wi-Fi standard (802.11n) is actually the best Wi-Fi standard across all notebook PCs that came out around the same time as the Latitude 14 E7440.
An 802.11a wi-Fi standards is the worst Wi-Fi standard across similar types of portable PC.