Yes, the SkyMiles members of Delta Airlines can use the Wi-Fi service for free. Moreover, the other passenger can also use this service by paying a nominal fee, and if flyers are elite members or traveling in the upper class, they can save on fees. However, wifi on Delta Airlines is only available on selected flights and regions. To get information about flights and regions with this service of Delta Airlines, flyers can contact with airline's customer representative on call, or they can check out the provided blog by Airlines Group Travel.