Delta plans to roll out WiFi access across its entire fleet this year. Late last year, the airline offered free WiFi on its shuttle flights for two weeks to promote the new service between New York and Boston and New York and Washington, D.C. The airline plans to wire one plane every two to three days until all of the airline’s planes have WiFi available. Northwest planes will also receive WiFi as the two airlines merge. The cost is $9.95 for unlimited access on flights of three hours or less and $12.95 for flights of more than three hours. Delta passengers can access email, the Web and use instant messaging. They can’t, however, make VolP calls, cruise pornographic sites and view any other content Delta deems inappropriate for the general flying public.