Delta tomorrow becomes the second airline to offer Gogo Inflight Internet service on board a handful of its jets. You stilll can't talk on your cell phone -- something that, as we reported in last week's column, will please many readers. But you will be able to send and receive e-mail and text messages, and surf the Web, on five MD-88 jets and one 757. The service will cost $9;95 for flights of less than three hours, and $12.95 for flights over three hours. The first two weeks -- meaning from now until after Christmas -- it will be free. Read all that Delta and AirCell, provider of the technology, want you to know in their news release,.