The Latitude 14 E7240 has an 802.11n wi-Fi standards which is better than most laptops that are a similar age to it. Most comparable spec laptops that are a similar age to it 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 notebook PC's Wi-Fi standard (802.11n) is in fact the best Wi-Fi standard across all ultrabooks that have been available for a similar time to the Latitude 14 E7240.
An 802.11a wi-Fi standards is the worst Wi-Fi standard across similar types of notebook PC.