Walt Mossberg of the Wall Street Journal uses test version of Aircell Gogo: He finds it works pretty much as the company is promoting it. Most medium-bandwidth activities work well, while video is choppy. The company told him it would prioritize data, so that email and Web connections would work for the most people. There's nothing new in the article for readers of this site about the technology (modified cell data), cost ($10 for sub-3-hour flights, $13 for longer flights), or speeds. But Mossberg says the service could launch in three American cross-country routes as soon as July, with Virgin following.