Delta Airlines announced today it begin a phased roll out of Wi-Fi access across its entire fleet beginning this fall. If all goes according to plan, all 330 aircraft will be outfitted by next summer. Delta claims it will be the first U.S. airline to equip its entire domestic fleet with Wi-Fi. Five other domestic carriers also have Wi-Fi projects underway. Delta said it will charge $9.95 for access on flights of three hours or less and $12.95 for longer flights. In keeping with federal rules prohibiting in-flight calls, voice services will not be supported.